I've only known the JANET flights to operate out of McCarran-Las Vegas, but I've haven't been able to get a ticket yet.
A good source of Area 51 info is http://www.dreamlandresort.com
read the stories on this web-page and then determine if there is something to protect.
The place is pretty secure by a manned security agency for being 'under-used'...a 12foot high barbed wire fence and security cameras would do the trick, but the posted sign's authorizing 'Deadly Force" if caught trespassing seems a bit over-board to protect someone from Nuclear waste, etc.....,
I have a tendency to believe the guy on the Oil Rig in the north sea who is also a plane spotter and some type of member of the 'Home-Guard'..Civil Aviation type of guy, who spotted the large delta wing behind the KC-10 Extender accompianed by 2-3 other normal Air Force type fighters.............similiar to the guy who got the grainey photo of the F-117 over Carmel, California-USA one day, and the photo was published in one the the Popular Mechanic type magazines...Ooooops!
Stuff is out there..and the Good Ole US Gov't won't tell us anything until they feel it's necessary.