The idea of getting anything free on a flight sounds like a joke nowadays, so it may come as a shock that some airlines offer free alcohol on their flights.
With airlines charging for things like meals, blankets, and even seats, it's surprising that there are airlines that still give free alcohol on planes. Most of the airlines are outside of the United States, with the exception of Delta Airlines and American Airlines, but the majority of airlines that offer free booze only offer them on international flights. Even more surprising if that the free alcohol isn't limited to those in first class.
Despite these airlines offering free alcohol, getting plastered is not encouraged. Airlines still have the right to prevent someone from flying if they're too intoxicated and it's in your best interest not to make a fool of yourself on a public plane, like Kelly Osbourne did recently as she was coping with her brother's multiple sclerosis diagnosis.
Here is a list of some airlines that offer free alcohol on international flights:
American Airlines (Only beer and wine on flights between the U.S. and Europe, Asia, and certain countries in South America.)
Delta Airlines (Only beer and wine on flights more than six hours long)
Hong Kong Airlines
Virgin Atlantic Airways
Here are the airlines that offer free alcohol on domestic flights:
Air New Zealand (Between 4:30-7 p.m.)
Lan Airlines (With meals)
For a complete list of airlines that offer free alcohol, check out the website MapHappy.