The Sabre Squadron | Aero L-159 Alca | Aero L-39 Albatros | No. 33 Squadron RAF | No. 263 Squadron RAF | squadron | Pacific Squadron | No. 45 Squadron RAF | No. 127 Squadron RAF | No. 617 Squadron RAF | No. 43 Squadron RAF | No. 38 Squadron RAF | No. 107 Squadron RAF | German East Asia Squadron | Far East Squadron | Aero Spacelines | Squadron (aviation) | Royal Aero Club | No. 77 Squadron RAAF | No. 71 Squadron RAF | No. 49 Squadron RAF | No. 48 Squadron RAF | No. 2 Squadron RAF | No. 233 Squadron RAF | No. 133 Squadron RAF | Asiatic Squadron | Aero Commander | 44th Fighter Squadron | 24th Tactical Air Support Squadron | 160th Fighter Squadron |
Knapp went to the United Kingdom with his unit, the 92d Aero Squadron (Bombardment), in August 1918, but failed to see action in World War I due to a late shipment of propellers for his unit's Handley Page O/400 bombers.