Spy and stealth planessome with bizarre, bat-shaped wings, others with triangular silhouettes that imply otherworldly designshave long generated UFO sightings and lore. And official denials feed rumors that the government isnt telling us about alien ships. The CIA estimates that over half of the UFOs reported from the 50s through the 60s were U-2 and SR-71 spy planes. At the time, the Air Force misled the public and the media to protect these Cold War programs; its possible the governments responses to current sightings of classified craftwhether manned or remotely operatedare equally evasive. The result is an ongoing source of UFO reports and conspiracy theories. Here are the Earth-built craft that likely have lit up 911 switchboards over the years.


Manufacturer: Lockheed Martin/Boeing First Test Flight: 1996 Deployment: None (it was canceled in 1999) Declassified: 1995 Size: 15 ft long; 69-ft wingspan Performance: 288 mph (cruising speed); 45,000+ ft (max. alt.)

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UFO Link: The official life span of this unmanned spy plane was brief and disappointing, with a crash and a program cancellation after just three years. But in 2003, Aviation Week reported that a similar stealth UAV was being used in Iraqfueling speculation that the government scrapped the craft publicly only to secretly resurrect it for clandestine missions.


Manufacturer: Lockheed Martin First Test Flight: 1955 Deployment: 1957 to present Declassified: 1960 Size: 49 ft long; 80-ft wingspan Performance: 410 mph (max. speed); 85,000 ft (max. alt.)

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UFO Link: Designed for high-altitude reconnaissance, the U-2s long, gliderlike wings and silver color would have been notable to observers on the ground and in the sky. In the 1960s the airplane was painted black to avoid reflections. The U-2 is also famous for being among the first classified planes to be flown from the Air Forces secret test facility at Groom Lake, Nev.aka Area 51.


Manufacturer: Lockheed Martin First Test Flight: 1964 Deployment: 1966 to 1990, 1995 to 1998 Declassified: 1964 Size: 107 ft long; 56-ft wingspan Performance: 2432 mph (max. speed); 85,000 ft (max. alt.)

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UFO Link: The tailless spy plane has an even more unusual cross section than the U-2. This Area 51 alum was briefly reactivated in the 1990s, and rumors of a followupthe now-legendary Aurora projecthave supplied both UFO believers and skeptics with a possible source of unexplained sightings.


Manufacturer: Lockheed Martin First Test Flight: 2006 Deployment: Unknown

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UFO Link: Plane spotters photos and videos blew the top-secret cover off a 5-minute inaugural flight in Palmdale, Calif. The hybrid airshipit uses gas and a wing shape for liftfuels speculation that classified airships quietly roam the night skies.


Manufacturer: Lockheed Martin First Test Flight: 1981 Deployment: 1983 to 2008 Declassified: 1988 Size: 107 ft long; 56-ft wingspan

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UFO Link: This long-range stealth fighter, which could stay aloft indefinitely thanks to midair refueling, remained classified through much of the 1980s during test flights at Tonopah Test Field Range in Nevada, 80 miles from the legendary Area 51 Groom Lake facility. Along with the B-2 Spirit, the batlike F-117A was a perfect candidate for triangular UFO sightings.


Manufacturer: Northrop Grumman First Test Flight: 1989 Deployment: 1997 to present Declassified: 1988 Size: 69 ft long; 172-ft wingspan

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UFO Link: Although the long-range b****er was never a true black aircraft, since it was displayed to the public approximately eight months before its first flight, an airborne B-2 is a UFO report waiting to happen. It looks like an alien craft from nearly any angle and specifically like a flying saucer when viewed head-on or in profile.