Originally Posted by
oleum
The transit is in DTW and requires that I go through US Immigration, which is why 1 hr 25 mins felt like it was cutting it fine. I've never flown through DTW. I don't have anything to base that on except that Immigration might eat up a big part of that time.
I connected many times in DTW arriving from CDG and immigration is always a breeze. The limiting factor is the luggage if you check some.
1h25 is perfectly fine in DTW.
If your wish to upgrade is just for getting off the plane faster, then keep your money for a better usage, because your bags won't be on the belt when you'll arrive there.