Rule 1: don't drink more than you can handle.
Corollary 1: don't drink if you don't know your limit.
Corollary 2: if you have the habit of exceeding your limit, don't drink.
How much is reasonable depends on the time of day, the duration of the flight and your activities after the flight. On transatlantic flights I usually stick to two red wines with the first meal service and sometimes take a brandy after supper service on the red-eye. I know I am capable of coherent action and thought with that intake. However I prefer to be a bit sobered up when passing immigration. I prefer to be sober when driving an unfamiliar (rental) car on unfamiliar roads.
BTW, drink lots of water to stay hydrated during the flight.
Last edited by MathFox; 5th Jul 2011 at 21:01.
Reason: who f*d the lay out?