Walter aircraft engines were used by the air forces of 13 countries before World War II.

[1] During World War II Walter made Argus engines under license for Germany.

This was the Soviet Klimov VK-1 engine, based on the Rolls-Royce Nene, which powered the MiG-15, and was exported to many countries.

In March 2007 it was announced that Walter Aircraft Engines would merge with Avia's aero-engine division.

[citation needed] In September 2007, it was announced that the company's assets (which do not include its current facility in Prague) would be purchased by GE Aviation.

Walter builds the M601 engine, which GE hopes to refine and position against Pratt & Whitney's PT6.