Fetch decoded current METAR observations and TAF forecasts for one or more ICAO airport identifiers, satisfying the 14 CFR 91.103(a) requirement to review available weather reports and forecasts. An airport id found in only one of METAR/TAF is returned with the other field null (not an error); an id absent from both is listed in notFound.

Fetch runway lengths/widths/surfaces and field elevation for a single ICAO airport identifier, satisfying the 14 CFR 91.103(b) requirement to know runway lengths at airports of intended use. Throws a clear error if the airport id is unknown.

Compute takeoff or landing ground roll and total distance over a 50ft obstacle for a Cessna 172R/S (Lycoming IO-360), satisfying the 14 CFR 91.103(b) requirement to know takeoff/landing distance data. Seeded with approximate POH-style performance data — see tool warnings for extrapolation/approximation caveats.

Compute trip fuel, Part 91 reserve fuel, and a go/no-go fuel margin for a route, satisfying the 14 CFR 91.103(a) requirement to consider fuel requirements. This is a basic burn-rate x time model (no climb/descent profile). Distance per leg must be supplied directly, or derived by the caller from get_airport_info coordinates first.

Find alternate airports near a given airport that currently meet minimum ceiling/visibility, satisfying the 14 CFR 91.103(a) requirement to consider alternatives if the flight cannot be completed as planned. IMPORTANT: this tool has no bulk geo-radius search — you must supply candidateAirportIds (nearby airports you already know from route context); it does not discover candidates on its own.

Fetch current NOTAMs for an airport from the FAA NOTAM Search API, satisfying the 14 CFR 91.103 requirement to review all available information. Requires FAA_NOTAM_CLIENT_ID and FAA_NOTAM_CLIENT_SECRET to be set in this server's environment (register at https://api.faa.gov); returns a clear 'not configured' error if they're unset rather than silently omitting NOTAMs from a briefing.