For security reasons, the US, most EU member states, and other countries now require airlines to provide details about their passengers before they travel. This is known as Advance Passenger Information (API).
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In most cases, you may not be allowed to travel if you do not provide your API in the time required. Providing your API should not be confused with applying for a visa. You will still need to follow the entry rules for every country you visit, as well as any customs and passport control regulations.
The AirLabs API is built from the ground up and allows you to track flights from United Airlines along with thousands other airlines through a single integration.
While it is not required to have a passport to make flight reservations, it is strongly recommended. While you may be able to book your airline ticket without your passport number, you must have a valid passport in hand before you arrive at the airport.
An IATA airport code, also known as an IATA location identifier, IATA station code, or simply a location identifier, is a three-letter geocode designating many airports and metropolitan areas around the world, defined by the International Air Transport Association (IATA).