Originally Posted by
Eemraldskies
It is true that we are not allowed to sell liquor on the ground because we do not have a liquor license for that. Alcohol can only be sold in the air and must be consumed in the air - not taken off the A/C.
I don't know what law that is, or where to find the info, but I do know that is what we are told.
That's consistent with what I've heard across other airlines - even ones that serve PDB's: you aren't supposed to take it with you. I remember our honeymoon trip - the FA slipped a full bottle of sparkling wine into my carryon bag just before we landed in Hawaii.

More recently I've heard that they are definitely *not* supposed to do that!!
I also know that many liquor laws require the server to open the drink before serving (otherwise it's considered package liquor, covered by a different license). I've never heard of any rules related to premixing vs. not premixing cocktails.