I was pretty excited yesterday when I was able to get over the 40,000 AAdvantage Mile threshold in order to qualify for a RT from IAD to PRG (connecting through LHR) this Fall. 20K going. 20K coming back. I wasn't excited to see the routing through LHR on BA with the taxes and fees being well over $600US. For the amount they were charging in taxes alone, I can pay the full fare and "Flot" IAD-SVO-PRG for less. So is there any possibility to avoid LHR on a trip to Europe on AA? I think the taxes and fees are not worth it and are absolutely ridiculous even when you have to cough up 40K in miles for the "reward".