Sacred Trust Incorporated appeared suddenly on the air-security scene in late 1936. Equipped almost exclusively with Focke-Wulf Hellhounds, STI became popular with smaller firms in the greater New York area. Their popularity rose sharply in early 1937 following a series of very public failures by their chief rivals, Blake Aviation Security. With the collapse of STI, Blake Aviation Security has retaken its place as the most successful air-security firm in North America.