A drone is a pilotless aircraft.    From Wordnet, Princeton University. 

Adjective : pilotless aircraft. ,a pilotless furnace.    From Dictionary.com. 

By 2030, commercial passengers will routinely fly in pilotless planes.    From Wordnik.com.  [Boing Boing: March 24, 2002 - March 30, 2002 Archives] Reference

Quetta: Pakistani parliamentarian maulana Sami-ul-Haq, termed the pilotless drone attacks from Afghanistan by US, an open violation of Pakistan sovereignty.    From Wordnik.com.  [Drone attacks are disgracing Pakistan Parliament] Reference

The thing was a kind of pilotless biplane of gossamer polymer, its wings silkscreened to resemble a giant butterfly.    From Wordnik.com.  [Neuromancer]

SHEPPERD: Lots of work going on in the pilotless area.    From Wordnik.com.  [CNN Transcript Oct 26, 2001] Reference

They are pilotless surveillance aircraft flying over head.    From Wordnik.com.  [CNN Transcript Jul 31, 2006] Reference

One tactic for this dangerous area, using pilotless planes.    From Wordnik.com.  [CNN Transcript Dec 17, 2009] Reference

It's a pilotless plane, so it is the operator who controls it.    From Wordnik.com.  [CNN Transcript Dec 17, 2009] Reference

Some analysts doubt that the pilotless planes are a real threat.    From Wordnik.com.  [Hizbullah's Worrisome Weapon] Reference

BLITZER: He got close with an unmanned, drone, pilotless aircraft.    From Wordnik.com.  [CNN Transcript Sep 9, 2001] Reference

I remember a pilotless cartoon drone kept buzzing our neighborhood.    From Wordnik.com.  [I own the cleanest home in America!] Reference

The U.S. kills more enemy suspects with pilotless planes in Pakistan.    From Wordnik.com.  [CNN Transcript Dec 17, 2009] Reference

The other turns the missile into a pilotless plane that flies to the target.    From Wordnik.com.  [The Mind Of A Missile] Reference

More suspects die by U.S. pilotless planes, but should the U.S. also beware?.    From Wordnik.com.  [CNN Transcript Dec 17, 2009] Reference

But, as the skies fill with pilotless planes, should we be worried about collisions?.    From Wordnik.com.  [CNN Transcript Nov 1, 2007] Reference

His plane flew pilotless for more than 200 miles before crashing in a Florida panhandle swamp.    From Wordnik.com.  [CNN Transcript Jan 13, 2009] Reference

It involves using those pilotless planes called drones that shoot missiles at terror suspects.    From Wordnik.com.  [CNN Transcript Dec 4, 2009] Reference

U.S. officials say the pilotless aircraft are a highly effective weapon against militant groups.    From Wordnik.com.  [U.S. drone attack in Pakistan kills 13 militants, 7 civilians] Reference

Was this one of the pilotless drones, one of the Hellfire missiles used or conventional warplane?.    From Wordnik.com.  [CNN Transcript Jan 13, 2006] Reference

You said last week it was probably a camera effect, possibly something duplicated or a pilotless drone.    From Wordnik.com.  [CNN Transcript May 17, 2004] Reference

COOPER: All right, Nic Robertson live from the border, where you can hear a pilotless drone overhead -- Nic, thanks.    From Wordnik.com.  [CNN Transcript Jan 8, 2009] Reference

But some, like Mansur, doubted that "sending pilotless planes" and using military means alone is the right approach.    From Wordnik.com.  [Nushin Arbabzadah: Finally, They Get It] Reference

Two missiles fired by a pilotless drone early Wednesday also struck other residents of the house in Zangara village.    From Wordnik.com.  [Pakistan Taliban Chief's Wife Killed in U.S. Missile Strike] Reference

Designated a surface-to-surface intercontinental missile, the Snark was a small, turbojet-powered pilotless aircraft.    From Wordnik.com.  [Strategic Air Command: People Aircraft and Missiles 2nd Edition]

And one of those officials from Kabul, as you've been mentioning, saying that it was a downed U.S. pilotless spy plane.    From Wordnik.com.  [CNN Transcript Sep 22, 2001] Reference

DARYN KAGAN, CNN ANCHOR: We are getting more information now on the pilotless plane that has been shot down over on Iraq.    From Wordnik.com.  [CNN Transcript Aug 27, 2001] Reference

The pilotless snapper-boat made another slow run, then put on speed and flashed back to the group of boats near the cruiser.    From Wordnik.com.  [Rip Foster Rides the Gray Planet] Reference

The Pakistan Taliban's leadership has been heavily targeted by missile strikes from Central Intelligence Agency pilotless drones.    From Wordnik.com.  [Suspect's Ties to Pakistan Taliban Probed] Reference

It turns out that, pilotless as the planes may be, a pilot does have to be nearby to guide them into the air and handle landings.    From Wordnik.com.  [Tom Engelhardt: Terminator Planet] Reference

Later Tuesday, up to 50 militants were reported killed in suspected missile strikes by U.S. pilotless drones in South Waziristan.    From Wordnik.com.  [Rival of Pakistan Taliban Chief Is Assassinated] Reference

What about drones, the pilotless vehicles that have been apparently so useful going after al Qaeda or Taliban targets in Pakistan?.    From Wordnik.com.  [CNN Transcript May 14, 2009] Reference

MCINTYRE (voice over): At Creed Air Force Base 60 miles northwest of Las Vegas, a pilotless plane lands under a blistering desert sun.    From Wordnik.com.  [CNN Transcript Jul 9, 2008] Reference

But there's also a lot of other assets in the area, highly specialized assets like the unmanned aerial vehicles, the pilotless planes.    From Wordnik.com.  [CNN Transcript Oct 12, 2001] Reference

What that is probably a flare or a series of flares or possibly one of these pilotless drone planes that the military are using these days.    From Wordnik.com.  [CNN Transcript May 12, 2004] Reference

If his administration simply increases attacks from pilotless drones, it will only push more wavering tribes further into the Taliban camp.    From Wordnik.com.  [Malou Innocent: What Obama Should Do in Pakistan] Reference

All three strikes, carried out by pilotless aircraft, took place Wednesday in North Waziristan, a stronghold for Taliban and al-Qaida-linked militants.    From Wordnik.com.  [Drone Strikes Kill 15 in Northwest Pakistan] Reference

Though the Air Force and Navy tried pilotless aircraft with curiously comical names like Snark, Navaho, Hound Dog and Regulus, the hapless crafts would stray miles off course.    From Wordnik.com.  [The Mind Of A Missile] Reference