The Traveler's Quick Reference
Dense, practical reference for international travel. Last reviewed: 2025.
Electrical Plug Types
| Type | Shape | Primary Countries |
|---|---|---|
| A | 2 flat parallel blades | USA, Canada, Mexico, Japan, Central America, Caribbean |
| B | 2 flat blades + 1 round grounding pin | USA, Canada, Mexico, Japan (less common) |
| C | 2 round pins ("Europlug") | Most of Europe, South America, Asia, Africa — the universal plug |
| D | 3 large round pins in triangle | India, Nepal, Sri Lanka |
| E | 2 round pins + hole in socket (French standard) | France, Belgium, Poland, Slovakia, Czech Republic, Tunisia |
| F | 2 round pins + grounding clips (Schuko) | Germany, Austria, Netherlands, Spain, Portugal, Sweden, Norway |
| G | 3 rectangular blades in triangle | UK, Ireland, Malta, Malaysia, Singapore, Hong Kong, UAE |
| H | 3 flat pins in Y-shape | Israel, Palestine |
| I | 2 or 3 flat angled blades | Australia, New Zealand, China, Argentina |
| J | 3 round pins | Switzerland, Liechtenstein |
| K | 2 round pins + U-shaped grounding | Denmark, Greenland, Bangladesh |
| L | 3 round pins in a row | Italy, Chile, Uruguay, Ethiopia |
| M | 3 large round pins | South Africa, India (older), Nepal |
| N | 2 round pins + grounding (IEC standard) | Brazil, South Africa (new standard) |
Practical notes: - Type C fits into E, F, and several other sockets — carries it as your European backup - Type G (UK) requires its own adapter; nothing else fits UK sockets - Schuko (F) and French (E) outlets are cross-compatible via combo adapters - South Africa uses both M (legacy) and N (modern) — pack both or a universal adapter - Many airports and modern hotels globally have USB-A/C ports regardless of local type
Voltage & Frequency
The Two Worlds
| Region | Voltage | Frequency |
|---|---|---|
| Americas (most), Japan | 110–120V | 60Hz |
| Europe, Asia, Africa, Australia, most of world | 220–240V | 50Hz |
Americas detail: USA, Canada, Mexico, Caribbean (most islands), Central America, parts of South America (Colombia, Venezuela, Ecuador, Peru) → 110–120V/60Hz.
Exceptions: Brazil uses 127V in some states and 220V in others — check before plugging in anything.
Adapter vs. Converter: The Critical Difference
Adapter = changes the plug shape only. Allows physical connection. Does NOT change voltage.
Converter = changes the voltage. Required if your device is single-voltage (110V-only) in a 220V country.
Dual-voltage devices (marked 100-240V~ or INPUT: 100-240V on the label) need only an adapter. This includes:
- Virtually all modern laptops
- Smartphones and USB chargers
- Most camera chargers
- CPAP machines (check your model)
- Electric shavers (most modern ones)
Single-voltage devices needing a converter: - Older hair dryers (big, bulky, often not worth it — buy locally) - Curling irons and flat irons (unless dual-voltage model) - Some small kitchen appliances
Pro tip: A 2000W+ converter for hair tools costs $30–50 and weighs a pound. Most travelers buy a dual-voltage travel hair dryer instead ($20–40) and skip the converter entirely.
Frequency note (50Hz vs 60Hz): Usually irrelevant for electronics. Matters for clocks and some older motors — if your device relies on AC frequency for timing, check the label.
Passport Power Rankings
Visa-free + visa-on-arrival access, approximate 2024–2025 data. Rankings shift; verify at Passport Index or Henley Index before travel.
| Rank | Country | ~Destinations |
|---|---|---|
| 1 | Japan | 193+ |
| 2 | Singapore | 192+ |
| 3 | Germany | 190+ |
| 3 | France | 190+ |
| 3 | Spain | 190+ |
| 3 | Italy | 190+ |
| 7 | Finland | 189+ |
| 7 | Sweden | 189+ |
| 7 | Austria | 189+ |
| 7 | Luxembourg | 189+ |
| 11 | Denmark | 188+ |
| 11 | Netherlands | 188+ |
| 11 | Ireland | 188+ |
| 11 | Switzerland | 188+ |
| 15 | United Kingdom | 187+ |
| 15 | Belgium | 187+ |
| 15 | New Zealand | 187+ |
| 15 | Norway | 187+ |
| 19 | Portugal | 186+ |
| 19 | Australia | 186+ |
USA: Typically ranks 7–9th, ~186 destinations. Strong but trails top EU/Asian passports due to Cuba and a few others.
Canada: Similar to USA, often tied or slightly below.
Countries with the most restrictions on them (hardest passports): Afghanistan, Iraq, Syria, Pakistan, Yemen — typically under 30 visa-free destinations.
Time Zones
24 reference cities covering UTC-12 through UTC+14. All offsets are standard (non-DST) unless noted.
| UTC Offset | City | DST? |
|---|---|---|
| UTC−12 | Baker Island (uninhabited) / International Date Line West | No |
| UTC−11 | Pago Pago, American Samoa | No |
| UTC−10 | Honolulu, Hawaii | No (Hawaii does not observe DST) |
| UTC−9 | Anchorage, Alaska | Yes (US DST) |
| UTC−8 | Los Angeles / Vancouver | Yes (US/Canada DST) |
| UTC−7 | Denver / Phoenix | Denver: Yes; Phoenix: No (Arizona exception) |
| UTC−6 | Chicago / Mexico City | Chicago: Yes; Mexico City: Yes (but dates differ) |
| UTC−5 | New York / Toronto / Bogotá | NY/Toronto: Yes; Bogotá: No |
| UTC−4 | Halifax / Caracas / Santiago | Halifax: Yes; Caracas: No; Santiago: Yes (southern hemisphere) |
| UTC−3 | Buenos Aires / São Paulo | BA: No; São Paulo: Yes (southern hemisphere) |
| UTC−2 | South Georgia Island | No |
| UTC−1 | Azores, Portugal | Yes |
| UTC±0 | London / Reykjavik | London: Yes (BST in summer); Reykjavik: No |
| UTC+1 | Paris / Berlin / Rome / Lagos | EU cities: Yes (CEST); Lagos: No |
| UTC+2 | Cairo / Johannesburg / Athens | Cairo: No; Johannesburg: No; Athens: Yes |
| UTC+3 | Moscow / Nairobi / Riyadh | Moscow: No (Russia abolished DST 2014); Nairobi/Riyadh: No |
| UTC+4 | Dubai / Baku | No |
| UTC+5:30 | Mumbai / New Delhi | No (India does not observe DST) |
| UTC+7 | Bangkok / Jakarta | No |
| UTC+8 | Beijing / Singapore / Hong Kong / Kuala Lumpur / Perth | No |
| UTC+9 | Tokyo / Seoul | No |
| UTC+10 | Sydney | Yes (southern hemisphere, Oct–Apr) |
| UTC+12 | Auckland | Yes (southern hemisphere) |
| UTC+14 | Kiribati (Line Islands) | No |
DST Global Overview
- Does DST: Most of USA, Canada, EU, Mexico, most of South America, Australia, New Zealand, some Middle East countries
- Does NOT do DST: Japan, China, India, most of Southeast Asia, most of Africa, most of Middle East, Iceland, Arizona (USA), Hawaii (USA), Russia (since 2014), Singapore
- Trap: Australia and New Zealand observe DST opposite to the Northern Hemisphere — summer for them is November–March
Airport Codes: 100 Major Airports
North America
| Code | Airport | City |
|---|---|---|
| ATL | Hartsfield-Jackson | Atlanta |
| LAX | Los Angeles Intl | Los Angeles |
| ORD | O'Hare Intl | Chicago |
| DFW | Dallas/Fort Worth | Dallas |
| DEN | Denver Intl | Denver |
| JFK | John F. Kennedy | New York |
| SFO | San Francisco Intl | San Francisco |
| SEA | Seattle-Tacoma | Seattle |
| LAS | Harry Reid Intl | Las Vegas |
| MCO | Orlando Intl | Orlando |
| MIA | Miami Intl | Miami |
| CLT | Charlotte Douglas | Charlotte |
| PHX | Phoenix Sky Harbor | Phoenix |
| EWR | Newark Liberty | Newark/NYC |
| IAH | George Bush Intercont. | Houston |
| MSP | Minneapolis-St. Paul | Minneapolis |
| BOS | Logan Intl | Boston |
| DTW | Detroit Metro | Detroit |
| PHL | Philadelphia Intl | Philadelphia |
| LGA | LaGuardia | New York |
| YYZ | Toronto Pearson | Toronto |
| YVR | Vancouver Intl | Vancouver |
| YUL | Montréal-Trudeau | Montreal |
| MEX | Benito Juárez | Mexico City |
| CUN | Cancún Intl | Cancún |
| GRU | São Paulo-Guarulhos | São Paulo |
| EZE | Ministro Pistarini | Buenos Aires |
| BOG | El Dorado | Bogotá |
| LIM | Jorge Chávez | Lima |
| SCL | Arturo Merino Benítez | Santiago |
Europe
| Code | Airport | City |
|---|---|---|
| LHR | Heathrow | London |
| CDG | Charles de Gaulle | Paris |
| AMS | Amsterdam Schiphol | Amsterdam |
| FRA | Frankfurt Main | Frankfurt |
| MAD | Adolfo Suárez Barajas | Madrid |
| BCN | El Prat | Barcelona |
| FCO | Leonardo da Vinci | Rome |
| MUC | Munich Intl | Munich |
| ZRH | Zurich Intl | Zurich |
| VIE | Vienna Intl | Vienna |
| BRU | Brussels Intl | Brussels |
| CPH | Copenhagen Kastrup | Copenhagen |
| OSL | Oslo Gardermoen | Oslo |
| ARN | Stockholm Arlanda | Stockholm |
| HEL | Helsinki-Vantaa | Helsinki |
| ATH | Athens Intl | Athens |
| IST | Istanbul Intl | Istanbul |
| SAW | Sabiha Gökçen | Istanbul |
| DUB | Dublin Intl | Dublin |
| LIS | Lisbon Humberto Delgado | Lisbon |
| WAW | Chopin Intl | Warsaw |
| PRG | Václav Havel | Prague |
| BUD | Budapest Ferenc Liszt | Budapest |
| CIA | Ciampino (Ryanair Rome) | Rome |
| ORY | Orly | Paris |
| LGW | Gatwick | London |
| EDI | Edinburgh Intl | Edinburgh |
| MXP | Malpensa | Milan |
Asia-Pacific
| Code | Airport | City |
|---|---|---|
| DXB | Dubai Intl | Dubai |
| HKG | Hong Kong Intl | Hong Kong |
| SIN | Changi | Singapore |
| ICN | Incheon Intl | Seoul |
| NRT | Narita Intl | Tokyo |
| HND | Haneda Intl | Tokyo |
| PEK | Capital Intl | Beijing |
| PKX | Daxing Intl | Beijing |
| PVG | Pudong Intl | Shanghai |
| SHA | Hongqiao Intl | Shanghai |
| BKK | Suvarnabhumi | Bangkok |
| DMK | Don Mueang | Bangkok |
| KUL | Kuala Lumpur Intl | Kuala Lumpur |
| DEL | Indira Gandhi Intl | New Delhi |
| BOM | Chhatrapati Shivaji | Mumbai |
| SYD | Sydney Intl | Sydney |
| MEL | Melbourne Intl | Melbourne |
| AKL | Auckland Intl | Auckland |
| MNL | Ninoy Aquino | Manila |
| CGK | Soekarno-Hatta | Jakarta |
| SGN | Tan Son Nhat | Ho Chi Minh City |
| HAN | Noi Bai | Hanoi |
Middle East & Africa
| Code | Airport | City |
|---|---|---|
| DOH | Hamad Intl | Doha |
| AUH | Abu Dhabi Intl | Abu Dhabi |
| RUH | King Khalid | Riyadh |
| JED | King Abdulaziz | Jeddah |
| TLV | Ben Gurion | Tel Aviv |
| CAI | Cairo Intl | Cairo |
| JNB | O.R. Tambo | Johannesburg |
| CPT | Cape Town Intl | Cape Town |
| NBO | Jomo Kenyatta | Nairobi |
| LOS | Murtala Muhammed | Lagos |
| ADD | Bole Intl | Addis Ababa |
| CMN | Mohammed V Intl | Casablanca |
Airline Alliances
Star Alliance — 26 member airlines
Key members: United, Lufthansa, Air Canada, Singapore Airlines, ANA, Thai Airways, Turkish Airlines, Swiss, Austrian, TAP Air Portugal, LOT, Avianca, Copa
Strengths: - Largest alliance by member count and route network - Best coverage of Central/South America (Avianca, Copa, Avianca affiliates) - Strong across Pacific (United, ANA, Singapore) - Excellent Europe connectivity (Lufthansa group + Swiss + Austrian)
Earn/burn: Earn miles on any Star Alliance flight, redeem on any partner. United MileagePlus and Lufthansa Miles & More are the anchor programs.
Choose Star Alliance when: Flying heavily in the Americas or Europe–Asia via the Pacific. United hubs (ORD, IAH, EWR, SFO, LAX) are excellent connection points.
SkyTeam — 19 member airlines
Key members: Delta, Air France, KLM, Korean Air, China Southern, China Eastern, Aeromexico, Alitalia (ITA Airways now outside), Saudi Arabian, Vietnam Airlines, Kenya Airways
Strengths: - Best for transatlantic (Delta + Air France/KLM hub into CDG/AMS) - Strong China access via China Southern and China Eastern - Good Southeast Asia via Vietnam Airlines - Delta's US domestic network is the most reliable
Earn/burn: Delta SkyMiles anchors the US side; Flying Blue (Air France/KLM) anchors the European side. Flying Blue often has better redemption value for European awards.
Choose SkyTeam when: Transatlantic travel, heavy China routing, or if Delta's domestic network aligns with your home city.
oneworld — 13 member airlines
Key members: American Airlines, British Airways, Cathay Pacific, Qatar Airways, Japan Airlines, Qantas, Iberia, Finnair, Malaysia Airlines, Royal Jordanian
Strengths: - Best luxury/premium product (Qatar Business, Cathay Biz, JAL First) - Strongest for Middle East (Qatar via DOH) - Best for Australia/Pacific (Qantas) - Solid Europe-Asia via London (BA + Cathay) - American AAdvantage miles offer some of the best partner redemptions
Earn/burn: AA AAdvantage, British Airways Avios (excellent for short-haul), Qatar Avios, Qantas Frequent Flyer
Choose oneworld when: Premium cabin travel, Australia/Pacific routing, or Middle East connection. Qatar Airways DOH hub is one of the world's best airports.
Alliance-agnostic tip: Low-cost carriers (Ryanair, easyJet, Southwest, AirAsia, IndiGo, Wizz Air) belong to no alliance. They typically offer the best prices on short-haul but zero partner benefits or upgrades.
Travel Insurance Guide
What's Worth It
| Coverage | Worth It? | Notes |
|---|---|---|
| Medical evacuation | YES — always | Air ambulance from SE Asia or Latin America: $50,000–$200,000. Your health insurance almost certainly won't cover this. |
| Emergency medical | YES (if traveling abroad) | USA domestic health insurance rarely covers international care. Check your policy. Medicare: no international coverage at all. |
| Trip cancellation | Maybe | Worth it if trip cost exceeds $2,000 AND you have non-refundable bookings. Skip if flights/hotels are largely refundable. |
| Trip interruption | Usually yes (if included) | Often bundled with cancellation. Covers returning home mid-trip for covered reasons. |
| Baggage/personal items | Usually no | Most premium credit cards cover this. Check your card's travel protection before paying for it twice. |
| Rental car CDW | Depends | Credit card coverage often sufficient; decline the rental company's overpriced collision waiver. But read your card's exclusions (some exclude trucks, SUVs, certain countries). |
| Cancel for any reason (CFAR) | Niche | Costs 40–60% more; covers ~75% of non-refundable costs. Only worthwhile for very expensive, uncertain trips. |
What to Look For in a Policy
Must-haves: - Minimum $100,000 medical evacuation coverage (ideally unlimited) - Minimum $50,000 emergency medical (ideally $100,000+) - 24/7 emergency assistance hotline - Coverage for your planned activities (skiing, diving, motorcycles often require riders) - Pre-existing conditions waiver (buy within 14–21 days of first trip deposit to qualify)
Red flags: - Coverage limits under $50,000 for medical - Exclusions for adventure sports if you plan any - No evacuation coverage — a cheap policy often omits this - Primary vs. secondary: primary pays first; secondary requires you file with your health insurer first (more hassle)
Recommended providers (no endorsement, commonly cited): World Nomads (adventure travelers), Allianz (mainstream), IMG Global, Seven Corners, Travelex
Credit card travel insurance: Amex Platinum, Chase Sapphire Reserve, and similar premium cards offer trip cancellation, baggage, and rental car coverage. Medical evacuation is usually NOT included. Do not rely on credit card insurance as your primary medical coverage.
Jet Lag Protocol
Based on circadian biology. The goal: shift your internal clock to destination time as quickly as possible.
The Core Science
Your circadian rhythm is primarily regulated by light exposure (via the suprachiasmatic nucleus) and secondarily by meal timing, temperature, and social cues. Melatonin signals "it's getting dark" — it's a timing hormone, not a sedative.
Direction Matters
Eastbound travel (losing hours, e.g., NYC → London): - Hardest direction — you're shortening your day - Your body needs to advance its clock (go to bed and wake earlier) - Seek bright light in the morning at your destination - Avoid bright light in the evening at your destination (fools your body into staying on old time)
Westbound travel (gaining hours, e.g., London → NYC): - Easier — you're extending your day - Your body needs to delay its clock (go to bed and wake later) - Seek bright light in the evening at your destination - Morning is the danger zone — try to stay up past fatigue
Pre-Trip Adjustment
Start shifting 2–3 days before departure: - Eastbound: Go to bed and wake up 1 hour earlier each day - Westbound: Go to bed and wake up 1 hour later each day - Adjust meal times along with sleep
Melatonin Timing
- Dose: 0.5mg (low dose, physiological — not the 5–10mg often sold, which is pharmacological)
- Timing: Take 5 hours before your destination's desired bedtime, starting 2 days before travel
- Not a sleeping pill: Take it at the right time, not when you're tired
- Higher doses cause grogginess without better clock-shifting; stick to 0.5mg
Flight Day Strategy
- Set your watch to destination time immediately on boarding
- Eat on destination time — skip the meal if it's "lunchtime" on the plane but 3am at your destination
- Hydrate aggressively — cabin humidity is 10–20%; dehydration worsens everything
- Avoid alcohol and caffeine during the flight (both disrupt sleep architecture)
- Sleep strategically: Only sleep on the plane if it aligns with nighttime at your destination
- Light blocking: Eye mask + earplugs for sleep windows; skip them during "destination daytime"
Arrival Day Protocol
- Stay awake until destination bedtime — even if exhausted; do not nap past 20 minutes
- Get outside for natural light during the local day (most powerful clock-resetter)
- Exercise lightly in the morning at your destination (promotes alertness and clock advancement)
- Melatonin at destination bedtime (0.5mg) for first 2–3 nights
- Avoid heavy meals in the 2 hours before bed
Rule of thumb: 1 day per hour of time zone difference for full adjustment. You can halve this with the above protocol.
Tap Water Safety
Status: Safe (drink from tap) / Boil (treat or boil first) / Avoid (bottled water recommended).
Safe to Drink From Tap
Australia, Austria, Belgium, Canada, Czech Republic, Denmark, Finland, France, Germany, Iceland, Ireland, Israel, Italy (most cities), Japan, Luxembourg, Netherlands, New Zealand, Norway, Portugal, Singapore, Slovenia, Sweden, Switzerland, United Kingdom, United States
Exercise Caution / Treat or Boil
Argentina (Buenos Aires tap is technically safe but many locals avoid it), Brazil (varies by city; São Paulo/Rio: boil or filter recommended), China (tap water not recommended for drinking even if treated — heavy metals and aging pipes), Greece (safe in Athens; islands vary), Hungary, Poland, Romania, Russia, South Africa (safe in Cape Town and Johannesburg; townships and rural areas: avoid), Spain (safe in most cities; some areas taste heavily chlorinated), Turkey (tap technically treated; most locals and travelers use bottled)
Avoid — Use Bottled Water
Afghanistan, Albania (rural), Bangladesh, Bolivia, Cambodia, Cuba, Dominican Republic, Ecuador, Egypt, El Salvador, Ethiopia, Ghana, Guatemala, Honduras, India, Indonesia, Iran, Iraq, Jamaica, Kenya, Laos, Mexico (tap water in major cities treated but not recommended for tourists — sensitive stomachs), Morocco, Myanmar/Burma, Nepal, Nicaragua, Nigeria, Pakistan, Panama, Peru, Philippines, Sri Lanka, Thailand, Ukraine (post-infrastructure damage), Vietnam, Zimbabwe
Notes: - "Safe" is relative — travelers often have different gut flora from locals; even safe water can cause upset stomachs - Ice: In "Avoid" countries, ice at hotels and tourist restaurants is usually purified; street ice is risky - Filtered water bottles (e.g., LifeStraw, Grayl) can upgrade any source to safe
Driving on the Left vs. Right
Left-Hand Traffic Countries (drive on the left)
About 76 countries, primarily former British colonies
Major countries: - UK & Ireland — England, Scotland, Wales, Northern Ireland, Republic of Ireland - Asia: Japan, India, Sri Lanka, Bangladesh, Nepal, Pakistan, Malaysia, Singapore, Thailand, Indonesia, Myanmar - Oceania: Australia, New Zealand, Fiji, Papua New Guinea - Africa: South Africa, Kenya, Tanzania, Uganda, Zimbabwe, Mozambique, Zambia, Botswana, Namibia, Malawi - Caribbean: Jamaica, Barbados, Trinidad and Tobago, Cayman Islands, Bermuda - Other: Cyprus, Malta
Right-Hand Traffic Countries (drive on the right)
All others — the vast majority of the world, including all continental Europe, the Americas, most of Asia, most of Africa.
Roundabout Navigation
Right-hand traffic roundabout: - Traffic flows counterclockwise - Yield to vehicles already in the circle (from your left) - Enter from the right, exit to the right
Left-hand traffic roundabout: - Traffic flows clockwise - Yield to vehicles already in the circle (from your right) - Enter from the left, exit to the left
Switching side tip: The hardest moments are right after you start driving (muscle memory), at intersections with no traffic to follow, and when making turns onto empty roads. The mnemonic: "Keep the curb on the correct side." In LHT: left curb = left. In RHT: right curb = right.
International Driving Permit (IDP)
What it is: A standardized translation of your domestic license into 12 languages. Not a license itself — you must carry it with your regular license.
Who requires it: Most countries in principle accept domestic licenses for tourists, but IDPs are required or strongly recommended in: - Japan, South Korea (IDP required from most non-Asian countries) - Italy (technically required for non-EU drivers) - Greece, Spain (recommended) - Most of Eastern Europe - Most of Asia, Africa, Latin America - Countries requiring an IDP: Germany, Austria, and much of EU for non-EU licenses longer than 90 days
Where to get one: - USA: AAA or AATA — $20, same-day in person. Valid 1 year. - Canada: CAA — similar process - UK: Post Office - Australia: NRMA, RACQ, or state auto clubs
Lead time: Get it before you travel; not available abroad.
Duration: Most IDPs valid 1 year from issue. Some countries require it be less than 1 year old at time of use.
Countries where IDP is not needed (for most visitors): - EU/EEA countries accept each other's licenses freely - UK license valid in most Commonwealth nations - USA/Canada licenses work in Mexico, most of Caribbean, many Latin American countries for short stays (but get the IDP anyway — costs $20 and avoids arguments)
Quick-Reference Card: At-a-Glance
| Question | Quick Answer |
|---|---|
| UK plug from US adapter? | Type A→G adapter; device must be dual-voltage |
| Best passport for travel? | Japan/Singapore (193+ destinations) |
| Tokyo time zone? | UTC+9, no DST |
| What alliance is Delta? | SkyTeam |
| Is tap water safe in Mexico? | No — use bottled |
| Drive on left in Thailand? | Yes |
| Need IDP for Japan? | Yes — get before travel |
| Jet lag cure? | None. Manage with light + melatonin timing |
| Skip travel insurance? | Never skip medical evacuation coverage |
| Air ambulance cost? | $50,000–$200,000 without insurance |
For visa requirements, check IATA Travel Centre or your government's official travel advisory. For currency exchange, use Wise or a no-foreign-transaction-fee card rather than airport kiosks.