Pardon me for coming in late, what is your theory about what happened to flight 175?
Here is an account from CNN.
http://216.239.51.104/search?q=cach...ight+175+transcript&hl=en&ct=clnk&cd=10&gl=us
United Flight 175
United Flight 175 left Boston at 8:14 a.m. The controller watching the plane was the same one tracking Flight 11. At about 8:47 a.m., someone on United 175 changed the transponder code twice. The change went unnoticed for four minutes. After trying for several minutes to reach the cockpit of 175, the controller told a co-worker that there might be another hijacking.
The word of a second hijacking made its way up the chain of command, but top-level managers were in a meeting, presumably discussing Flight 11.
About 9:01 a.m., a manager from the FAA's New York Center called the national Air Traffic Control System Command Center.
New York Center: We have several situations going on here. It's escalating big, big time. We need to get the military involved with us. ...
We're, we're involved with something else; we have other aircraft that may have a similar situation going on here.
At about the same time, the FAA's New York Center contacted the New York terminal approach control about Flight 175.
Terminal: I got somebody who keeps coasting, but it looks like he's going into one of the small airports down there.
New York Center: Hold on a second. I'm trying to bring him up here and get you. ... There he is right there. Hold on.
Terminal: Got him just out of 9,500 ... 9,000 now.
New York Center: Do you know who he is?
Terminal: We're just, we just we don't know who he is. We're just picking him up now.
New York Center (at 9:02 a.m.): All right. Heads up man, it looks like another one coming in.
United 175 crashed into the south tower of the World Trade Center at 9:03 a.m.
In Boston, a manager discussed the first hijacker transmission from American 11 on a ongoing conference call.
Boston Center: Hey ... you still there?
New England Region: Yes, I am.
Boston Center: I'm gonna reconfirm with, with downstairs, but the, as far as the tape ... seemed to think the guy said that "we have planes." Now, I don't know if it was because it was the accent, or if there's more than one, but I'm gonna, I'm gonna reconfirm that for you, and I'll get back to you real quick. OK?
New England Region: Appreciate it.
Unidentified female voice: They have what?
Boston Center: Planes, as in plural.
Boston Center: It sounds like, we're talking to New York, that there's another one aimed at the World Trade Center.
New England Region: There's another aircraft?
Boston Center: A second one just hit the trade center.
New England Region: OK. Yeah, we gotta get ... we gotta alert the military real quick on this.
NORAD was notified at 9:03 a.m., and five minutes later decided to change the course of the fighters that had been scrambled from Otis Air Force Base.