Operators
- Canada
- Royal Canadian Air Force
- Czechoslovakia
- Czechoslovakian Air Force operated 2 or 3 Wacos, designated NK-4
- United Kingdom
- Army Air Corps
- Glider Pilot Regiment
- Royal Air Force
- No. 668 Squadron RAF
- No. 669 Squadron RAF
- No. 670 Squadron RAF
- No. 671 Squadron RAF
- No. 672 Squadron RAF
- No. 673 Squadron RAF
- United States
- United States Army Air Forces
- United States Navy
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