Jagdgeschwader 21
I. Gruppe:
Gruppenkommandeure:
Formed 15.7.39 in Döberitz, and on 6.6.40 became III./JG54.
Bases:
| 7.39 - 8.39 | Döberitz | Luftgau-Kommando III | Bf 109E |
| 8.39 - 7.10.39 | Gutenfeld | Luftgau-Kommando I | Bf 109E |
| 7.10.39 - 2.40 | Plantlünne* | Bf 109E | |
| 2.40 - 13.5.40 | Mönchen-Gladbach | VIII. Fliegerkorps | Bf 109E |
| 13.5.40 - 16.5.40 | Vogelsang | VIII. Fliegerkorps | Bf 109E |
| 16.5.40 - 22.5.40 | Neufchateau | VIII. Fliegerkorps | Bf 109E |
| 22.5.40 - 26.5.40 | Cambrai | VIII. Fliegerkorps | Bf 109E |
| 26.5.40 - 31.5.40 | Monchy-Breton | VIII. Fliegerkorps | Bf 109E |
| 31.5.40 - 6.6.40 | Guise | VIII. Fliegerkorps | Bf 109E |
* later to Hopsten, Krefeld, Münster and in 2.40 to Mönchen-Gladbach