Before lunch always a Bloody Mary, if they have the minimum functional fixings (wookie, S&P, lemon). If they have additional fixings (Tabasco, Celery Salt, etc) or make it particularly well and I'm not heading straight to work I might have another. Just water with food.

Late afternoon / early evening. As above but with G&T in place of Bloody Mary.

Dinner Flight. G&T pre dinner then red wine with dinner if its fit to wash your socks in. Otherwise I'll pass with dinner and then have a cognac afterwards.

Night flight. Wine in lounge then cognac onboard. Sleep.

Notable exception is on Emirates, who appear to have a note on file that they are to serve me an unsolicited G&T at every opportunity. "Good morning, I hope you slept well, here's your omelette and your usual G&T." I've tried numerous times to release them from this notion of my Gin obsession but have now given up and tend to just drink them.