Correct format for Global Entry member number on DL.com?
This has been driving me nuts, and with the new TT programs at DTW, I want to make sure my Global Entry enrollment is on my Delta profile, FWIW. The box for "Known Traveler" number isn't really clear on the format to enter... when I look at my GE status on the GOES website, I see a 9-digit number only. Entering these 9 digits produces an error on my profile page when I submit.
Below the box they give an example of AX123456789US.... I tried GExxxxxxxxxUS and it accepted the number, but is that the correct method for entry? If so, how the hell did they expect us to know that?