Dated 1961 and still the largest 880 kit ever made. The Convair 880 and it's near sister the 990 were very high performance airliners. Only 65 880s were produced from 1959 to 1962. The aircraft was designed to be smaller and faster than the DC-8 and 707 - this market did not develop, however, and if it did it could have been served with less expensive designs. The 990 was a larger and faster (mach .91) airliner, but it failed to meet it's range criteria for east to west crossings of the USA. As a result, only 37 were made. For these reasons and cost-per-hour of operation they did not find favor with commercial operators. Interestingly enough, several 990s continued to be operated by private owners and NASA operated two 990s for decades after the last 990 was phased out of commercial service