Developed as Boeing's first jet airliner, the 707 is a swept-wing design with podded engines. Although it was not the first jetliner in service, the 707 was the first to be commercially successful. Dominating passenger air transport in the 1960s and remaining common through the 1970s, the 707 is generally credited with ushering in the Jet Age.[8][9] It established Boeing as one of the largest manufacturers of passenger aircraft, and led to the later series of airliners with "7x7" designations.