Pictured is a Convair 990 Coronado, a lengthened version of the Convair 880, first introduced in 1961 to compete with the Boeing 707 and McDonnell Douglass DC-8. This Convair series was known for being the fastest commercial jetliner, achieving speeds of 615mph, but never saw widespread commercial adoption and only 37 990s were produced. None remain airworthy today.