Originally Posted by nd_eric_77
Seems that most US-based carriers get relegated to LGW. Is the UK govt just being protectionist in favor of BA, or are there other reasons?
The reason is the Bermuda II agreement which regulates air traffic between the US and the UK. Do a search for Bermuda II and you'll get the full background.
You'll see that a fair share of the blame also goes to the two US carriers allowed to access LHR (AA and UA).