ETOPS Alternate Airports

This regulation governs how airlines select alternate airports for ETOPS (Extended Operations) flights—flights where twin-engine aircraft operate far from suitable landing airports.

When dispatching an ETOPS flight, the airline must list enough alternate airports to ensure the aircraft always remains within its authorized maximum diversion time. At the time of dispatch, each listed alternate must have weather forecasts meeting the airline's ETOPS alternate minimums and field conditions allowing safe landing.

The airline must consider all adequate airports within the authorized diversion time when making these selections. Each alternate must also meet specific public protection requirements regarding aircraft rescue and firefighting services.

Once airborne, a stricter standard applies: the actual weather at ETOPS alternates must meet the requirements of §121.631(c), which typically means conditions must be at or above standard alternate minimums rather than just forecasts.

This ensures pilots operating over remote areas always have viable diversion options if an engine fails or another emergency occurs.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*