<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Shareholder:
The federal laws in most western countries prohibit the consumption of alcohol not supplied by the licenced carrier. This is also part of the standard international/IATA transport agreement on the use of alchohol in flight, or even on trains crossing state or international boundaries.</font>
That only makes sense. You can't for example, bring liquor into or out of a bar in most places. I'm not surprised they don't let you bring liquor on board a plane and consume it.
If you can't do it at a bar, where there are bouncers to throw you out if you cause problems and cops to take you away if you get really out of hand, there is no way in hell it makes sense to let you do it on a plane where you are on there for the duration of the flight.
Especially in light of the incidents where drunk passengers have done things like, well, make a mess of themselves on the food cart.