Did you know?
Did you know that interior climate controls for the rest of the plane can be controlled from the cockpit of these large planes?
Meaning they can control the level of oxygen pumped into the cabin (or NOT pumped into the cabin). So you can guess where I am leading.
The stewardess should have simply shut down the life support for the passenger sections of the plane until Liotta just passed out. I have heard commercial pilots admit to doing just this thing on flights with groups that appear to be having too much "fun" (meaning they are drinking too much). Just spike the air alittle till everyone is feeling drowsy and they fall asleep and then return the levels to normal.
So if you notice flight attendants inhaling from special tanks and then begin to feel light headed you might be experiencing the same thing. Nighty night.