Originally Posted by
Blumie
Just for clarity, combining the information from all of the posts:
1. Irrespective of which combination of airlines you take -- whether AA/BA or BA/BA -- you will need to reclear security upon arrival at LHR.
2. If you take AA/BA, upon arrival at Terminal 3 on AA, you will follow the signs to Flight Connections to Terminal 5, which will lead you to a shuttle bus to Terminal 5. Upon arrival at Terminal 5 your board pass will be scanned and you will reclear security.
3. If you take BA/BA, upon arrival at Terminal 5 on BA, you will follow the signs to Flight Connections within Terminal 5, which will lead you to an area where your boarding pass will be scanned and you will reclear security.
4. Assuming you are traveling on a single reservation, in neither case will you need to claim and recheck your luggage at LHR, and in neither case will you need to clear immigration.
5. You will claim your bags and clear immigration upon arrival at GVA.
Note that your BA/AA return is slightly different:
1. Upon arrival at LHR Terminal 5, follow the Flight Connections signs to Terminal 3, which will require you to take a bus to Terminal 3. Upon arrival at Terminal 3 you will reclear security.
2. When you land at DFW, you will need to clear US immigration and claim you luggage. As soon as you exit customs, you will be able to drop your luggage off at the baggage recheck counter.
3. You will then need to reclear security at DFW and proceed to your gate (which may require taking the airside train at DFW).