Originally Posted by IADCAflyer

If AA wants to consider IAD-LHR (it would be a wild a guess as to the equipment but I would think 763 or 788), AA might want to consider a secure shuttle from DCA to IAD. Passengers who are flying into DCA and connecting to the IAD-LHR flight would be put onto a sterile bus that proceeds directly from DCA to IAD - bus doors locked and sealed. Not sure of TSA has an allowance for this type of procedure (kind of like the ABE-EWR bus that UA (or was it CO)) used to run, but it would help populate the plane with additional passengers.