United Airlines’ operations center at Denver International Airport got a big update just before this summer’s big travel rush ...

United Airlines offered "men-only" flights from 1953 to 1970. ... Relax after a busy day on this special DC-6 mainliner flight. You’ll enjoy the informal, club-like atmosphere.

A 1951 United Airlines postcard showing the "Mainliner Denver," the same plane that was destroyed in the 1955 bombing. The explosion marked the first bombing of a U.S. commercial airplane and was ...