Yes, in a way.
NORAD=North American Aerospace Defense Command
(I know they can't spell..)
There are nine bases under NORAD command, six in the US, three in Canada.
These nine bases answer to NORAD, not the UN or their own governments.
There are three regions in NORAD command:
1.)Alaskan NORAD Region (ANR)
2.)Canadian NORAD Region (CNR)
3.)Continental US NORAD Region (CONR)
which is broken into three sectors...
Western Air Defense Sector at McChord AFB, Wash.; Northeast Air Defense Sector at Rome, N.Y.; and Southeast Air Defense Sector at Tyndall AFB, Fla.
On 9/11, NORAD was fully staffed and undergoing "Project Gaurdian"
(yeah, they suck...).
Once reports of the first hijacking were heard, unarmed F-16's were summoned from a training mission to investigate.
The first armed planes up in the air were out of Ohio (Wright Patterson).
After the second crash and attack on the Pentagon, Langley, and Andrews both had jets up over DC, all though, at differenet altitudes, they didn't
know the other was there.
No armed fighters were scrambled from NORAD bases until at least thirty minutes after the attack on the Pentagon. (The same thrity minutes Sec.
Rumsfeld dissapeared and ordered the elevation to Defcon Delta)
So if you think about it, the United States (excluding Canada) is protected by ten fighters at all times.
One base in California, and four in the East.
Canada is protected by six fighters at all times (three per base).
Alaska has two flights of gour fighters all flying at the same time in the event the Russsians did invade.
Operation Noble Eagle.
That's the new Operation code name to keep armed fighters in the air at all times.