Bean-counters in the airline industry claim alcohol-fuelled misbehaviour is costing the global aviation business US$1 billion annually.
If an unruly passenger causes a flight to be diverted, the costs (including new flights and last-minute accommodation for all other passengers) can hit US$200,000.
I love a drink when I fly. No matter how often you get into the air, it's always a bit of an occasion - generally when we fly, we're going somewhere exciting or off to see people we love. That's worth a toast. At the very least, we're not in the office. Salut to that!
But don't join the one-in-400,000 airline passengers who becomes a problem.
Since 2010, the International Civil Aviation Organisation (ICAO) estimates there have been more than 20,000 inflight incidents ranging from simply not following crew instructions to outright assault, drug use and sexual harassment. Not cool.