Advertising Postcard for Pan American Airlines, circa 1970, "The Plane with All the Room in the World"

For much of the 20th century, Pan American World Airways exemplified innovation in air travel. The carrier pioneered the use of wide-body jumbo jets, like the Boeing 747 featured on this postcard, in the 1970s. But rising fuel costs and difficulty establishing domestic U.S. routes strained the company in the 1980s. Pan Am ended operations in 1991.