Plane Took Off From Stennis International Airport In Mississippi The Solar Impulse 2, a long-range experimental aircraft, crashed in the Gulf of Mexico when it lost power during an unmanned test flight on May 4, a report from the National Transportation Safety Board (NTSB) said. There were no fatalities or injuries. The NTSB said the aircraft suffered a loss of power before crashing into the ocean. It was completely destroyed. No one was on board.