Question: What defense contractor operated a highly classified fleet of passenger aircraft to transport United States Air Force military and contractor employees?
Sentence (from "Keyway Air Transport"): Keyway Air Transport was a United States airline that operated from Frankfurt International Airport (which at the time was also home to a United States Air Force facility; Rhein-Main Air Base) using a Boeing T-43 Bobcat (a military variant of the Boeing 737-200) and a Boeing 707-355C.
Relevant evidence: No