Special Considerations
Document Inconsistencies: If travelers’ passports contains a sex
designation that differs from their current identification, airlines must still
transmit the information exactly as it appears on their passport documents.
CBP systems will only accept the “M” or “F” designation that matches travel
documents.
Non-Binary Passport Designations:
Passports issued with “X” or other non-binary markers will be rejected by CBP
systems, requiring resubmission with valid documentation showing “M” or
“F” designation.
Passport Updates: Travelers
experiencing documentation inconsistencies may wish to consult
with the relevant passport issuing authority about available options for
updating travel documents.