De Havilland DH.4 crash, May 11, 1921, Fort Sill-Henry Po...
De Havilland DH.4 accident on May 11, 1921 near Fort Sill-Henry Post Field AFB Oklahoma, United States with no fatalities.
- Date: May 11, 1921
- Aircraft: De Havilland DH.4
- Location: Fort Sill-Henry Post Field AFB Oklahoma, United States
- Fatalities: 0
- Phase of flight: En route
A United States Army Air Service De Havilland DH.4, serial AS-63566, crashed near Fort Sill, Oklahoma, on 11 May 1921 during a training flight. The crew fate is unknown.