The LT-1 was a slightly enlarged version of the Stearman M-2 Speedmail with four passengers in an enclosed cabin and space for 500 lb (230 kg) of mail.

[1] The LT-1 was powered by a 525 hp (391 kW) Pratt & Whitney Hornet radial engine, nose-mounted with its nine cylinderheads exposed for cooling.

Behind the engine there was a mail compartment and behind that a windowed cabin seated four passengers, provided with airspeed meter, altimeter and map box.

[1] Its tail was conventional, with a tailplane mounted on top of the fuselage and a cropped triangular fin with a rather angular balanced rudder.

Its mainwheels were on split axles and rearward drag struts, both mounted centrally on the fuselage underside, with vertical shock-absorbing legs.