Reply #13: I very much doubt

[DulceDecorum]

that ANYONE can give the time at which the Pentagon was damaged.

Summary
Since the time of plane impact at the Pentagon had often been reported with large scatter, the United States Army contacted us to inquire whether we could obtain an accurate time of the Pentagon attack on September 11, 2001 based upon our seismic network. We analyzed seismic records from five stations in the northeastern United States, ranging from 63 to 350 km from the Pentagon. Despite detailed analysis of the data, we could not find a clear seismic signal. Even the closest station (Ä = 62.8 km) at Soldier's Delight, Baltimore County, Maryland (SDMD) did not record the impact. We concluded that the plane impact to the Pentagon generated relatively-weak seismic signals. However, we positively identified seismic signals associated with United Airlines Flight 93 that crashed near Shanksville, Somerset County, Pennsylvania. The time of the plane crash was 10:06:05 ±5 (EDT).
http://members.fortunecity.com/911/wtc/seismic/WTC_PENT_KIM.htm

The US Army could not tell,
and neither can the seismic scientists.
But I wish you luck.

PS.
According to the BTS database,
only five AA planes took off from Dulles on September 11, 2001.
And NONE of them was Flight 77.
No AA plane that left Dulles was even heading toward California.

AA, 09/11/2001, 0599, N871AA, DFW, 7:49 Dallas Fort Worth Int.
AA, 09/11/2001, 0771, N3BFAA, SJU, 6:57 Luis Munoz Marin Int. PR.
AA, 09/11/2001, 0975, N3CAAA, MIA, 7:34 Miami International
AA, 09/11/2001, 1217, N2ANAA, ORD, 6:26 O'Hare International
AA, 09/11/2001, 1361, N493AA, DFW, 6:17 Dallas Fort Worth Int.

LoneStar was kind enough to provide us with the key
to AA's Enronesque N-number reporting.
Therefore, we can now take a good hard look
at the true identities
of the American Airlines planes that actually left Dulles
on September 11, 2001.

N871AA is Deregistered.
The registration was canceled on 11/23/2001.
It has had one major aviation incident.
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001213X32836&key=1

It was exported to Sao Tome & Principe.
Line Number 1324
Manufacturer Serial Number 21383
Model 727 223A
Registration S9-BAV
First Flight 24/02/78
Delivery 23/11/01
Operated by AIR GEMINI
Engines PW JT8D-9AHK
Ex Operators AAL
Previous Registrations N871AA

N3BFAA is the American Airlines alias for N929AN.
N3CAAA is the American Airlines alias for N946AN
N2ANAA is the American Airlines alias for N1412A.
N493AA is a normal number for a plane which once had a strange encounter.
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001208X05960&key=1

So if TURN THE CLOCK BACK TO SEPTEMBER 11,
this is what we have.

N871AA was still a US-registered (1978?) BOEING 727-223, serial number 21383.
N929AN is Assigned. It is a 2000 BOEING 737-823, serial number 30078.
N946AN is Assigned. It is a 2000 BOEING 737-823, serial number 30600.
N1412A is Assigned. It is a 1991 FOKKER F.28 MK 0100, serial number 11370.
N493AA is Assigned. It is a 1983 DC-9-82(MD-82), serial number 49731.

And therefore I find myself asking,
once again,
WHERDY GO?

But I digress.
We were talking about the time of impact at the Pentagon.
And we know that the Pentagon WAS hit.
One part of a Penta-wall collapsed.
Carry on.