Satellite imagery taken on January 17, 2006, of Area 51 reveals little. Base security personnel know when satellites are passing overhead, and test aircraft remain indoors at those times. Personnel work in windowless offices and are locked inside when anything other than their own project is outdoors. DigitalGlobeFrom Popsci.com:
Stealth jets? Hypersonic bombers? What's really being developed at the military's most famous classified base?
On a trip to las vegas in 2004, observing from my east-facing hotel room in the pyramidal Luxor Hotel at daybreak, I watched a fleet of six unmarked 737s make commuter flights to nowhere. These aircraft depart every weekday morning from a tidy, anonymous terminal on the western side of McCarran International Airport. A long line of cars pours into a 1,600-spot parking lot as the jets pull away from the terminal, taxi to the runways, and head out into the desert sky. At the end of the day, the shuttle flights return and the lot empties. The passengers go home and tell their families nothing about what happened at work that day.
Cut to April 4 this year. San Diego is hit by a rumbling shock that isn´t an earthquake. It is ruled out by the media as a sonic boom after military operators claim it is not one of their aircraft. San Diego Union-Tribune reporter Alex Roth does some digging and comes up with six puzzlingly similar incidents around the country since 2003.
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My Comment: This article came out two years ago .... but I think it is still relevant today.