I'll be flying BA DEL-LHR into T5. Then five hours later I'll fly AA LHR-ORD from T3. I am AA EXP, will be flying coach. Quick questions - 1. After arriving in T5, do pax have access to duty free shopping are and lounges etc. (in T5), or do they have to proceed to immigration, exit etc.? Airports differ in this regard and my LHR experience is minimal. 2. If we will have access to shops and lounges in T5, are they "better" than what we'll find in T3? Trying to decide how to divide 5 hours between T5 (if it is an option) and T3. 3. At T3, I assume BA lounges are better than AA, but if you think differently, please let me know. Thanks!