Lawson L-4

L-4
The Lawson L-4 "Midnight Air Liner" circa 1921
Role Three-engined biplane airliner
Manufacturer Lawson Airplane Company
First flight Not flown
Primary user Lawson Airplane Company
Number built 1
Interior photograph of the Lawson L-4 showing washroom facilities and sleeping berths

The Lawson L-4 was the last in a series of Lawson biplane airliners designed and built by Alfred Lawson under the livery of the Lawson Airplane Company of Milwaukee, Wisconsin. The largest of the series, it was designed for long-distance flights. It was completed in 1920 but never flew, crashing on its initial takeoff.