Not so easy connecting at Heathrow
AA uses Terminal 3 at LHR while Qatar uses Terminal 4. That means one needs a lot of patience and gets a lot of exercise on this terminal change and connection. No need to clear customs as inter-terminal bus service operates point-to-point service between the terminals. It's a long walk just to get to that bus, although signage is quite good.
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Once in T4, another security check to get in. IMO, Britain has to rank right up there with the worst, most clueless and inefficient security screening on the planet.
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