1 Apr 1937
- Hugo Sperrle was promoted to the rank of Generalleutnant. ww2dbase [Hugo Sperrle | CPC]
- Air Vice Marshal John H. S. Tyssen became the commanding officer of the No. 12 Group RAF. ww2dbase [CPC]
- The Howaldtswerke operations in Kiel, Germany was sold to Deutsche Werke Kiel AG. ww2dbase [Howaldtswerke Kiel | Kiel, Schleswig-Holstein | CPC]
- Akagi was taken out of service and entered drydock for extensive modernization at Sasebo Naval Arsenal, Japan. Records showed the date of this event simply as "Apr 1937"; the exact date was not noted. ww2dbase [Sasebo Naval Arsenal | Akagi | Sasebo, Nagasaki | CPC]
- Prince Naruhiko of Higashikuni, an aviation enthusiast, christened the Ki-15 aircraft that was about to make a record flight from Japan to Europe "Kamikaze". ww2dbase [Naruhiko | CPC]

1 Apr 1937 Interactive Map
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