Teller1900
En-Route
faa.gov said:Airspace restrictions and procedures implemented around Washington, D.C., after the 9/11 terrorist attacks in order to make the region safer and more secure are now permanent under a final rule issued by the Federal Aviation Administration.
Read more here. Or the final rule in PDF form, here.
Problem is those guys in the jets are faster than the Secret Service. As you could see from the tape they were so secret you didn't even know they were there.