Mesa Air Group said it has suspended two pilots of a go! airlines flight that overshot Hilo Airport on Wednesday.

The Federal Aviation Administration and the airline are investigating whether the pilots had fallen asleep during the incident.

The morning flight from Honolulu turned back and landed safely after overshooting the airport in Hilo by 15 miles.

Officials said air traffic controllers tracking the plane by radar were unable to contact the cockpit for 25 minutes.

Mesa has not released names of the suspended pilots but a spokesman said the captain has more than 15 years of flying experience.

An airline internal memo says the company takes seriously any occurrence that has the potential of adversely affecting normal operations of a flight.

An FAA spokesman said the agency plans to interview the pilots of the 214-mile flight. Under FAA rules, they could be subject to a warning, suspension or license revocation depending on the findings.

A radar track of the flight provided by www.flightaware.com shows that the plane remained at 21,000 feet as it flew past Hilo before returning to the airport.