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The National Transportation Safety Board released a preliminary report of its investigation into a go! airlines flight that flew past the Hilo airport on Feb. 13, apparently because the two pilots fell asleep.

A check of the plane after the flight showed no problems with its pressurization system or carbon monoxide in the plane, according to the report. The NTSB also says there were 40 passengers and three crewmembers on the flight, which left Honolulu at 9:16 a.m.

Flight 1002 was at 21,000 feet when air traffic controllers made several attempts to contact the pilots. Controllers contacted the plane at about 10 a.m., but by that time the plane had flown about 15 miles past the airport. It landed safely about 15 minutes later.

The preliminary report draws no conclusions about why the plane overshot the airport.

Mesa Air Group, which owns go!, has suspended the two pilots. FAA spokesman Ian Gregor said the NTSB and the FAA are conducting separate investigations into whether the captain and first officer fell asleep during the flight.

Flight logs obtained by the Star-Bulletin say both pilots finished their Feb. 12 shift at 2:47 p.m. and returned to duty at 5:40 a.m.

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