Diary April 21, 194004-1940, Diary WW2, War Diary, Year 1940 / April 21, 2020 April 21, 2020 / Leave a Comment / By Kretaner / 1 minute of reading British Vickers Wellington bombers on the way to their target.Diary for Sunday, April 21, 1940: Air War RAF bombers (1 lost) raid Aalborg airfield (north Denmark) and Stavanger–Sola airfield. for sharing: Share Tweet LinkedIn