"He was scary," a witness said. "He started kicking profusely and started punching the window." Passengers on board restrained the man with the only tools they had available: zip ties and a shoelace.

A Frontier Airlines passenger was restrained on a flight from Denver to Houston after he allegedly began screaming and punching the aircraft window

An unruly passenger on a Frontier Airlines flight was seen on video yelling and being taken down by fellow passengers.