A passenger on a Frontier Airlines flight had to be restrained by other travelers after he broke a plane window.

A crazed Frontier Airlines passenger was restrained by a group of fellow travelers with makeshift restraints after repeatedly punching the seat in front of him before cracking a window with his foot.

An out-of-control Frontier Airlines passenger punched an airplane window so hard that it cracked before he was hogtied by other passengers. The unidentified man was on board Frontier Flight 4856 ...