[2] A new aircraft plant was built adjacent to Los Angeles Municipal Airport and operations began there the same month.

[4][5] In a 1940 court case, the National Labor Relations Board decided against the company, ordering it to stop discriminating against employees who joined the United Automobile Workers union.

[9] This expected increase was enabled in part by the company's "Fabri-Clip" invention, which allowed the fabric skin of an airplane to be attached in much less time than traditional methods.

The company also manufactured bomb shackles, machine gun and cannon chargers, hydraulic actuators, and other aircraft components.

[16][17][18] Interstate Engineering moved to Anaheim, California in the mid-1950s, was acquired by Figgie International in 1967, and sold to Engles Urso Capital Corporation in 1996.