CBP Enforces Binary Sex Codes and Enhanced US Passport Validation in APIS
Sex Field Requirements: Effective Oct. 14, 2025, CBP systems will only accept “M” (Male) or “F” (Female) in the sex field of APIS transmissions. Any other characters will result in an “X Response-Insufficient Information” error, requiring airlines to resubmit the passenger data with corrected information.

I don’t agree with the change, and I don’t see why your private parts should determine whether you can travel. However, I’m confused by the headline after reading an article about this
The article says they simply must make a binary choice on documents. But the headline says they are banned from travel.
Can’t they simply choose whatever box will get them their passport? Are they actually banned? Is the headline alarmist? (Even in the best case, I am very sure this will cause a lot of hassle for this poor minority group that gets repeatedly treated like a political football)
It also needs to match your passport, plenty of people still have X on thier passport. So anyone with an X on thier passport can no longer use a plane to leave the country.
Right gotcha, now the headline makes sense
I guess they’ll have to reapply for passports. This is total bullshit, especially when you’re messing with overseas residents