Things Travelers Assume About International Airports That Aren't Always True

A six-hour layover in a major city sounds like a sightseeing opportunity — and sometimes it is. But many countries require travelers to hold a transit visa before they can pass through immigration and exit the airport. Whether you need one depends on your passport, your destination, and that specific country's rules. Some countries offer visa-on-arrival options; others require advance applications. Always verify with the official embassy or consulate of the layover country well before your travel date.

The "duty-free" label refers to taxes collected at the point of sale in the departing airport — not a blanket exemption from import rules. When you land, customs officers apply the allowances of the country you're entering. For Americans returning home, US Customs and Border Protection sets limits on alcohol, tobacco, and goods by value. Exceeding those limits means paying duty — or having items confiscated. Check the official CBP website or your destination country's customs authority for current thresholds before you shop.

When you book two separate tickets — even on the same travel day — airlines generally treat them as independent journeys. That means collecting your bags at the connecting airport, clearing customs if required, and rechecking them for your next flight. Even within a single booking, some budget or regional carriers don't participate in interline baggage agreements. Confirm the baggage transfer policy with each carrier on your route, and always build extra time into connections that involve different airlines or ticketing systems.

These trusted traveler programs streamline screening at participating US airports. Abroad, they carry no weight. Foreign airports operate under their own country's aviation security authority, with their own rules about liquids, electronics, footwear removal, and allowable items. Some countries have stricter limits on liquids or require laptops to be removed even when US-bound airports do not. Research the specific screening expectations for each airport on your route — don't assume your US experience translates.

The convenience of an airport kiosk comes at a cost. Exchange operators in airports often apply wider spreads between buy and sell rates, plus flat service fees. The result is that travelers who exchange large amounts at the airport can lose a meaningful percentage of their money before they've left the terminal. For a full comparison of your options — including ATM withdrawals, travel-specific bank cards, and local exchange bureaus — see our guide to currency exchange abroad.

Airlines publish minimum connection times as a scheduling baseline, not a comfort guarantee. Factors like a late-arriving inbound flight, a gate change, a long walk between terminals, or an immigration queue for transit passengers can all erode that buffer quickly. At large hub airports, terminal-to-terminal transfers can take 30–60 minutes even when everything goes smoothly. When booking international connections yourself, building in more time than the published minimum is a practical safeguard — not overcaution.