In the late 1950s, three major airlines — United Airlines, Eastern Air Lines, and American ... Boeing produced the 727-200, which is 20 feet longer and can hold a few dozen more seats.

DALLAS — Today, in 1964, the three-engined Boeing 727 entered service with launch customer Eastern Air Lines (EA), one of the "Big Four" domestic airlines created by the Spoils Conferences of 1930.