Originally named the Koppen-Bollinger Aircraft Company after its founders Otto Koppen and Lynn Bollinger, the Helio Aircraft Corporation started in 1948 and produced a few models of short takeoff and landing (STOL) aircraft, most notably the Courier.  It ceased production in 1974 and went through a troubled legal history.  A successor called Helio Aircraft LLC exists today and is said to be planning to reintroduce the Courier.

Helio Courier

The Courier, first flown April 14, 1949, is a light aircraft of spectacular slow-speed performance, capable of flying as slow as 28 miles per hour.  It can take off in a few plane lengths and operate off of unprepared surfaces.  About 500 Couriers were built.  They were popular as bush aircraft and also served with the U.S. military and the Central Intelligence Agency.  Numerous Couriers are still in service.

U-10D Super Courier 61-14360

This military Courier is exhibited at the National Museum of the USAF, marked as an aircraft of the 5th Air Commando Squadron in Vietnam in 1968.