Security National Aircraft Corp. established by 'Bert' Kinner 1933 at Downey (LA), to build S-1-A Airster side-by-side low-wing 2-seater similar to Kinner Sportster. Suspended manufacture at No. 15 in 1935, formed new company Security Aircraft Corp. 1937 to build improved S-1-B but taken over 1939 by American Aircraft.