Light liaison airplanes, affectionately known as Lbirds, were indispensable in World War II, serving as artillery spotters, light transports, and even flying ambulances. Take a look back to EAA AirVenture Oshkosh 2016, when we celebrated many of these unsung heroes like the massive Stinson L1, the ubiquitous Piper L4, and the original grasshopper, the Aeronca L3.