Why is the International Society of Women Airline Pilots called ISA+21, and not ISWAP?
In 1978 when ISA was founded, the original name was the International Social Affiliation of Women Airline Pilots. The founders wanted an acronym that some how symbolized their group and was also used in the aviation community. They chose to use ISA, also an acronym for International Standard Atmosphere, and the appendage of +21, acknowledging the original 21 members. (Used in aviation, ISA+21 would mean that the atmosphere was 21 degrees above standard.
