I haven't seen the show but I think it depends on what the hijackers want.

So long as they are content to give orders but not enter the flight deck the old rules should apply--give them what they want. If they try to force their way onto the flight deck, though, attack at once. You don't want them to get the controls and you also want to protect the pilots--if you lose them you had better hope someone on board can figure out the radio.