Where are F-35 flight tests taking place, and how are they progressing?

Flight tests are currently under way at Edwards Air Force Base, Calif., and Naval Air Station Patuxent River, Md. All three F-35 variants are currently in flight test. We continue integration and verification testing of the F-35 software systems to include flying to all edges of the flight envelope and weapons testing . We also built six ground-test F-35s to verify structural integrity and a full-scale radar-signature test model. At the end of 2014, approximately 65 percent of the SDD test program was completed.