Aircraft with the most flight hours have been cleared to return to service, but with some restrictions.

Flight pause begins Monday after tilt-rotor aircraft suffers engine failure in November incident in New Mexico

Leonardo's model AW609 took off for the first time on October 13 and will serve as a demonstration aircraft

Bristow Group will be the first company to take delivery of the Leonardo aircraft, which has been in development for many years

Leonardo's AW609 model now has the 4th prototype in flight, already configured to the production standard

Aircraft manufacturer, Leonardo plans to deliver first unit in 2020 after FAA certification