Pan American World Airways, originally founded as Pan American Airways and more commonly known as Pan Am, was an airline that was the principal and largest international air carrier and unofficial flag carrier of the United States for much of the 20th century. The first airline to fly worldwide, it pioneered innovations such as jumbo jets and computerized reservation systems, and introduced the first American jetliner, the Boeing 707, in 1958. Until its dissolution on December 4, 1991, Pan Am "epitomized the luxury and glamour of intercontinental travel", and it remains a cultural icon of the 20th century, identified by its blue globe logo, the use of the word "Clipper" in its aircraft names and call signs, and the white uniform caps of its pilots.