The Lawson Air Line Company designed and built a series of large biplane airliners for use on its planned airline routes.

The initial Lawson "Aerial Transport" Lawson C1 or T-1 was built early in 1919 to demonstrate that a large commercial passenger plane could be built.

The L-1 was a single pilot, 10 passenger biplane with twin Liberty 400 hp pusher engines.

[3] Mr. Lawson took it on a 2000-mile multi-city tour to advocate commercial air travel.

[4] Some sources state Mr. Lawson himself as the sole designer; others mention involvement of Vincent Burnelli.