Loening Model 23

Model 23 Air Yacht, S-1
S-1 of the USAAS
Role Flying boat airliner
National origin United States
Manufacturer Loening
First flight 1921
Number built 16

The Loening S-1 Flying Yacht, also called the Loening Model 23, was an early light monoplane flying boat designed in the United States by Grover Loening in the early 1920s. The aircraft won the 1921 Collier Trophy.