The Aero A.42 was a Czechoslovakian bomber aircraft of 1929 that was only ever produced in prototype form.

However, the Czechoslovak Air Force was not satisfied with it for a number of reasons.

In particular, the aircraft's take-off and landing runs were felt to be excessively long, and crew complained about the cramped cabin.

On September 20, 1930, one of the two prototypes set international speed records of 253.42 km/h (157.47 mph; 136.84 kn) over a 1,000 km (620 mi) closed circuit, carrying payloads of 500 kilograms (1,100 lb) and 1,000 kg (2,200 lb).

[2] The A.42 was a single-engined high-wing cantilever monoplane with fixed landing gear.