In the wake of multiple "copycat" hijackings in 1972 (see above), the FAA required that all Boeing 727 aircraft be fitted with a device, later dubbed the "Cooper vane", which prevented lowering of the aft airstair during flight.[145] Several airlines elected to abandon use of the airstair entirely, and simply welded the aft doors of their 727s shut.[142]

A less-well-known modification mandated as a direct result of the hijacking was the installation of peepholes in all cockpit doors, making it possible for the cockpit crew to observe events in the cabin with the door closed.[146]
[edit] Subsequent history of N467US

In 1978 the hijacked 727-100 aircraft was sold by Northwest to Piedmont Airlines (later absorbed by US Airways), where it was renumbered N838N and continued in domestic carrier service.[147] In 1984 it was purchased by the now-defunct charter company Key Airlines, renumbered N29KA, and incorporated into the Air Force's civilian charter fleet, shuttling workers between Nellis Air Force Base and the Tonopah Test Range in Nevada, during the top-secret F-117 Nighthawk development program.[148] In 1996 the aircraft was scrapped for parts in a Memphis boneyard.[60]



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