Structural Testing Northrop Grumman constructed two additional aircraft without engines or instruments for fatigue testing. On the second of those test aircraft (the B-2 on display at the museum), engineers attached computer-controlled, hydraulically driven plates along the airframe to simulate all flying conditions. They calculated that the structure would reach 150 percent of the design specifications, but the wing withstood stresses over 161 percent before it finally cracked. Early production

A Northrop N9M-B flying wing (one third scale development aircraft for the projected XB-35 bomber) filmed during a test flight in California in 1942. IWM WPN 46 | Imperial War Museum London

On September 14, 2003, an F-16C from the U.S. Air Force Thunderbirds, tail number 87-0327, crashed during an air show at Mountain Home Air Force Base in Idaho. The pilot, Captain Christopher Stricklin, ejected safely after a miscalculation during a “Split-S” maneuver, which involves rolling the aircraft upside down before diving and pulling up. Stricklin began the maneuver too low, and with insufficient altitude to correct the error, he ejected at 140 meters. Fortunately, no injuries were report

Investigators are analyzing the crash site and debris from the F-35 fighter jet that seemingly vanished Sunday afternoon after experiencing a "mishap" over South Carolina. The pilot safely ejected from the jet. Martha Raddatz has the latest details. https://trib.al/r6EdCey | ABC World News Tonight with David Muir