This whole thing concerns me.
I love a drink. I won't die sober.
Certainly not on a flight.
So I have a couple of wines before a flight. Before a Ryanair flight I'll have a last one and be the last on the flight.
Not delaying the thing, of course, just sure to be that last in the queue at the rear door.
I do regular stints. My latest normal one is the return between Charlerois and Edinburgh. I emphasise that I am a drunk - one who wears a suit.
Two wines get me through the flight, or maybe a large G&T.
Planes aren't great places to drink. I can if needed drink before, during and after a flight.