You would walk up and down the aisle and punch out selected passengers. Once you had suitably subdued a passenger you click a security badge and the "Airport Rental Security" guys come and drag the passenger off.
The game timer would be a chart of United's share price. The round is over when the price hits zero.
The price could rise and fall with certain events:. A passenger stumbling back on the plane for instance.
The game would end immediately if you punched a baby - even United agents don't punch babies!
Feel free to run with it!!