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| Lockheed Martin test pilot David Nelson put F-35B BF-3 into STOVL mode for the first time on Flight 101 on 25 April 2011. The flight took place at NAS Patuxent River, Maryland. |
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| The fourth F-35B short takeoff/vertical landing jet, BF-4, descends to its first vertical landing on 27 April 2011 at NAS Patuxent River, Maryland. Marine Lt. Col. Fred Schenk piloted the aircraft during the flight, which was the forty-seventh for BF-4. |
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| Lockheed Martin test pilot Bill Gigliotti takes the F-35C CF-2 on its first taxi test in Fort Worth on 21 April 2011. |
