getomitt re Delta 764s,
Not a chance ,they are fitted out with a lot of lie flat beds and are aimed at high yield business routes..hence why you get so many in LHR.
Jaibird
re AA 767s and problems off the current runway..
When they operated 767-200s with underated engines, when the air temp hit more than 21c with high humidity the air was too thin to lift them off the runway, and numerous times had to offload cargo.
However this was rectified when they introduced 767-300s which had more powerful engines.
BHX are looking at AA using 757s on the route although that would be a bit tight westbound with their 757 range limitations all the way to ORD.
Nigel