AirTrail returns each airline as {icao, iata, name}, but the import reduced it to the ICAO/IATA code, so an imported flight showed e.g. 'EWG' instead of 'Eurowings'. The picker and the stored reservation now use the airline name (falling back to the code when AirTrail has none). The raw code is kept in metadata.airline_code so the writeback to AirTrail still sends a code, not a name (#1240), and the change-detection snapshot hash stays on the code so existing flights don't spuriously re-sync.
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