In a previous lifetime I was flying out to Frankfurt on a weekly basis - flying out Sunday and back Friday. There was no such thing as a sober flight.
A couple of large G&Ts in the BA lounge - then champagne onboard (normally 2 bottles) followed by cognac with coffee (again, normally 2 bottles).
Sounds familiar. When I was commuting to Zurich it was pretty much the same, although Swissair/Crossair didn't do champagne, we had to put up with red wine. Single-class Embraers on the Birmingham flight, so we used to sit at the back where we could chat to the flight attendants and scrounge extra free booze.