I am trying to use some AA miles to purchase a one way ticket to BLR from MCO this summer (return ticket already purchased - long story).

The only available option for my preferred travel date - and I don't know how American sells tickets with so short a transfer time - includes a transfer in London in three hours (Gatwick to Heathrow).

My question is what happens if I miss the connecting flight? Is the onus on me or on British (which both legs are on) to put me on the next flight to BLR?