Originally Posted by
chinafish
Just spoken to the gate agent who's put a note on my AA46 booking to explain I'm stuck on this delay.
Is there anything else I can protectively do?
Sounds like you've got your bases about as covered as they can be.
If it looks like you're definitely getting into ORD too late to make the cutoff, you might try calling AA the instant you land so they can rebook you (though hold times might be prohibitive). Alternatively, head to the Admirals Club before leaving security if you happen to have a boarding pass for your LHR flight.
Good luck!