Thanks, you are correct going through LHR has much more availability. If I want to use American miles to upgrade a BA flight, booked through American I think Expert Flyer is showing C class upgrades available Boston to Heathrow 9/24. I am still new with EF, would anybody be kind enough to help confirm the business class award upgrade on EF? Thank you. AA (BA) 6891 Boston to LHR departs 7:35AM on 9/24. Shows C7 if I ran it correctly.