In April of 2019, a set of master keys that provides almost total access to O’Hare Airport were lost and never recovered. The keys granted access to roughly 100 perimeter gates, 150 other gates on the grounds and an “unkown amount” of doors, elevators and washrooms at O’Hare. There are only a handful of these clusters of master keys. They’re kept by Chicago Department of Aviation security officers who patrol the grounds, a line of defense against terrorists and trespassers. So they’re supposed to be closely guarded.
To learn more about this breach in security at one of the major U.S. airports read the full article by the Chicago Sun Times here.