I will be studying abroad this summer and the program I am in is having Flightfox help book for us. I've never been abroad so I don't know if 1.5 hours is too tight or just enough time, and if being a U.S. citizen helps?
I will land from LHR (London) to ORD (Chicago) at 2PM on August 9th, then my flight from ORD to SFO would depart at 3:20PM the same day. This will be with British Airways from LHR to ORD and American Airlines from ORD to SFO.
EDIT: Thank you all for responding me and helping me understand what I can do since I probably will not make it... Because this study aboard program is paid for, I don't have much of a choice since I can't afford to pay for additional costs that exceeds the budget they gave us. I will ask the flight agent about it being the same pnr/ticket so I can at least be able to rebook the flight for free if I don't make it to the original flight. I will also look into the MPC app since I don't know what Global Entry is (any information is appreciated though!) If there are any more tips, then please let me know.