| Country | Date | |
|---|---|---|
| UK | 4 March 1939 | |
| Denmark | 5 June 1939 | |
| USA | 15 June 1939 | (New York City, New York) |
| USA | 20 June 1939 | |
| France | 4 August 1939 | |
| France | 4 July 1945 | (re-release) |
| West Germany | 18 December 1965 | (TV premiere) |
| Ali che non tornano | Italy |
| Armes secrètes | France |
| Clouds Over Europe | USA |
| Hemmelige planer | Denmark |
| Nubes sobre Europa | Argentina |
| Ondas misteriosas | Spain |
| Testflug QE 97 | West Germany (TV title) |
| Plot summary | Box office and business | User comments |
| Ratings | External reviews | DVD |
| Main details | Recent releases | IMDb now playing |