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.
Correct, if I’m understanding it correctly, I am not a lawyer, it will also prevent you from entering the country via plane. They want M or F only.
I’m also pretty sure preventing a citizen from entering the country violates some international law, but I also could be wrong about that.
Thanks for the clarification. That is how I understand as well. Also not a lawyer.