Douglas DC-3 1936 4.3 Million
Douglas DC-6 1946 144 Million
Boeing 707 1958 1.3 Billion
Boeing 747 1970 3.7 Billion
Boeing 777 1995 7.0 Billion
Airbus A380 2007 14.4 Billion
all figures in US$ 2004 constant values
however, we are talking about STC and not new development