http://www.cnn.com/2004/US/01/06/fre...ght/index.html
According to this CNN article, the passenger WAS taken off DL43 she was examined, found safe, then put on another one to Cincinatti.
Apparently after all of this, DL43 still got fighter escort while the statement about passengers not allowed to leave their seats is troubling to say the least.
I am thinking that the examination of the jacket must have been concluded much before the aircraft was even close to landing.
The only justification I can see is if this passenger was thought off as a "diversion" from the rest off the passengers which contained further terrorists.
A bit paranoid in my opinion if everything is as the article states.
Let's see if anything new arises.