Back in the 80's when I worked for a well regarded airline subsequently absorbed by a Bigger Airline it was not uncommon for a bottle or two of Krug to be opened on finals so the ride in the crew bus to our hotel was somewhat merry
When seconded to an Indian Ocean outfit by my muslim employers in the mid-90's I was delighted to find a glass of Grande Dame placed in the drink holder of my 767 just after shutdown. Very civilised!
As to drinks in flight- the national airline of a large European wine producer apparently used to serve a glass of wine with their crew meals. Since Les buggers probably hadn't NOT had a glass of red with their lunch since before puberty i'd suggest it was probably less dangerous than their going through withdrawal on a long haul flight?
Cheers!