Liaison aircraft was primarily a name used by the armed forces of the United States, and to a degree the United Kingdom, but we will be including pages on helicopters as they were initially serving alongside the Liaison aircraft and other similar aircraft used by other nations.
Pre-WWII (Between the Wars) Aircraft
Douglas O-49
WWII Liaison Aircraft
United States
Stinson L-1 “Vigilant” – blog posts
Taylorcraft L-2 –
Aeronca L-3 / O-58 “Defender” / “Grasshopper” –
Piper L-4 “Cub” or “Grasshopper” – blog posts
Stinson L-5 “Sentinel” –
Interstate L-6 –
Sikorsky R-4 (Helicopter) –
United Kingdom
Taylorcraft Auster
Russia
Germany
Fieseler Fi 156 Storch
Japan
Post WWII Liaison Aircraft
United States
Cessna L-19/O-1 “Bird Dog”
Modern “relatives”