He stood, handed his helmet to his brother with his head bowed, and walked slowly toward the tilt-rotor aircraft that would take him home.

Another promising aviation technology is tilt-rotor aircraft.

Two of the tilt-rotor aircraft crashed last year, killing 23 marines.

From other staging areas nearby, two more CV-22 tilt-rotor aircraft lifted off at the same time and raced for the estate.

We're going after a prize much greater than a few tilt-rotor aircraft," Cazaux said, extending a hand.

The phenomenon is particularly marked in tilt-rotor aircraft.

The announcement set off a new debate about the tilt-rotor aircraft.

The forces have long advocated the development of the revolutionary tilt-rotor aircraft so that they could better carry out commando missions.

With remarkable speed and agility for a bird its size, the huge tilt-rotor aircraft moved smoothly toward the road.

Last week, he reluctantly gave in to the pressure and agreed to spend $1.5 billion this year and next to develop the tilt-rotor aircraft.