What is the alternate airport rule?

If either the ceiling or visibility is forecast to be less than 2,000 feet or 3 statute miles during that arrival window, you are required to file an alternate. Also, the destination airport must have at least one instrument approach procedure or an alternate airport will always be required.



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Airports with alternate minimums that are not authorized are denoted on the approach chart with the “ ” designation and are not listed in this section. NA - means alternate minimums are not authorized due to unmonitored facility, absence of weather reporting service, or lack of adequate navigation coverage.

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Not more than one hour from the departure airport at normal cruising speed in still air with one engine inoperative. (2) Aircraft having three or more engines. Not more than two hours from the departure airport at normal cruising speed in still air with one engine inoperative.

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YFR means the flight initially will be operated under IFR, followed by one or more changes of flight rules. ZFR means the flight initially will be operated under VFR, followed by one or more changes of flight rules.

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To check-in and check bags at the airport, you must be there a certain amount of time before scheduled departure: Within the U.S. – 45 minutes. To or from destinations outside the U.S. – 60 minutes.

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ATC receives only your filed destination, not the alternate. This is why ATC has to ask where a pilot wants to divert. To give ATC a heads up on where you want to go, you can write it in the remarks section, which is transmitted to ATC.

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Non-towered airports may lie inside or underneath controlled airspace. In that case, some or all aircraft arriving and departing require clearances from a remote air traffic control unit, such as terminal or center control, even though there is no control tower managing landings and takeoffs.

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Federal Aviation Administration Develops, operates and maintains a nationwide system of airways. Certifies the air worthiness of aircraft (including permissible noise level of jet engines) Licenses airports to operate (considering such factors as site, runways, crash equipment and other aspects for safe operation)

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Every official airport in the world is given a three-letter code from IATA and a four-letter code from ICAO – from one of the world's largest airports, Dammam/King Fahd International Airport (ICAO: OEDF, IATA: DMM) in Saudi Arabia, to one of the smallest, Saba/Juancho E.

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So you can file with the destination or the alternate having only a GPS approach, but not both. WAAS-equipped aircraft can file for destinations and alternates having only GPS approaches. In both cases, the weather at the time of arrival must satisfy the LNAV or circling minimums or higher if noted.

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