7. Raising a ruckus
Your grandson's tantrum might not be your fault, but if you can't settle him down while waiting for takeoff, it's the airline's prerogative to take you off the plane. And if you yourself are a noisemaker — or worse, your behavior crosses the line from mildly assertive to rather aggressive — you're gone.
8. Taking off your shoes
Well, OK, you can be shoeless on the plane — though stinky feet might elicit complaints from those around you. But you need to keep your socks on. Barefoot passengers are technically verboten under most major U.S. airlines' regulations.
9. Holding up takeoff
Preflight announcements cover some of the misdeeds that can end your trip before it begins: refusing to turn off electronic toys, blocking emergency exits or not fastening seat belts.
10. Wild card behaviors
News reports of passengers who have been ousted include some head-scratchers, including two men who allegedly pressed their noses against a female stranger's neck to sniff her perfume. The upshot? Airlines have the final say on who gets kicked off, whether it's because of "the risk of harm or damage" or the "risk of offense or annoyance."