The Boeing 707 is a four-engined commercial passenger jet airliner developed by Boeing in the early 1950s. Its name is most commonly pronounced as Seven Oh Seven. Boeing delivered a total of 1,010 Boeing 707s including a smaller, faster model of the aircraft that was marketed as the Boeing 720.   Although it was not the first commercial jet in service, the 707 was among the first to be commercially successful. Dominating passenger air transport in the 1960s, and remaining common throughout the 1970s, the 707 is generally credited with ushering in the Jet Age. It established Boeing as one of the largest makers of passenger aircraft, and led to the later series of aircraft with 7x7 designations. Travolta is a certified pilot and owns five aircraft, including an ex-Australian Boeing 707–138 airliner. The plane bears the name Jett Clipper Ella in honor of his children. Pan American World Airways was a large operator of the Boeing 707 and used Clipper in its names. The 707 aircraft bears the marks of Qantas, as Travolta acts as an official goodwill ambassador for the airline wherever he flies. His $4.9 million estate in the Jumbolair subdivision in Ocala, Florida, is situated on Greystone Airport with its own runway and taxiway right to his front door.