Pan American World Airways, commonly known as Pan Am, was the principal international airline of the United States from the 1930s until its collapse in 1991.

Founded as a seaplane service out of Key West, Florida, the airline became a major company credited with many innovations that shaped the international airline industry, including the widespread use of jet aircraft, jumbo jets, and computerized reservation systems.

Identified by its blue globe logo and the use of the word "Clipper" in aircraft names and call signs, the airline was a cultural icon of the 20th century, and the unofficial flag carrier of the United States.