The in-flight drink of choice

As I read this news story about a French smoker whose drunken behavior disrupted his flight from Nice to New York, I couldn't help but be struck by one thing. The man in question had apparently downed a full liter of Bailey's Irish Cream. I have two questions. One, how did he get a bottle of Baileys on the plane when most people can't get a full bottle of shampoo? And two, Bailey's Irish Cream. Really? Not a liter of wine?