Working as a pilot in a flight where alcohol serve.It would be haram or not answer on the based on Glorious Quran and Hadiths. The Prophet (sal Allahu alaihi wa sallam) said: “Allah has cursed Khamr (intoxicants – alcohol, wine etc.), the one who drinks it, the one who pours it for others, the one who sells it, the one who buys it, the one who makes it, the one who it is made for, the one who carries it, the one who it is carried to and the one who consumes the money from its sale.say on this Hadiths.
Jazakallah khairan .

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

Working as a pilot is not forbidden. If alcohol is served on a flight, then this is undoubtedly evil, but it does not render the job of the pilot prohibited if his work does not involve offering alcohol (to passengers) or helping in it.

He must deny this evil according to his ability.

For more benefit on working as a pilot, please refer to Fataawa 387943 and 335077.

Allah knows best.