Oct 12 2025

CBP changes procedures for airline passengers with “X” passports

19 C.F.R. 4.7b (3)

CBP regulations require would-be airline passengers to identify as “F” or M”. These regulations were never changed, even when CBP was accepting “X” gender markers.

Traveler Gender CBP Data Element Validation: System Error if missing or invalid. Only submissions of “M” for male and “F” for female are accepted.

[CBP implementation guide says that only “M” and “F” are accepted in APIS data.]

U.S. Customs and Border Protection (CBP) has announced plans for changes to its procedures for processing information sent to CBP by airlines (and possibly also train, bus, and ferry operators) about passengers on international routes with non-binary or non-gendered “X” gender marker passports, to take effect on Tuesday, October 12, 2025.

The planned changes were disclosed by press release rather than by rulemaking notice in the Federal Register. Implementation has been outsourced to airlines subject to secret “Security Directives” from CBP.  Neither the current nor the planned procedures comply with the law. All of this makes it difficult to predict what will happen to anyone with an “X” gender marker on their passport who tries to make reservations, buy tickets, or check in for international flights after October 12th.

But here’s what we know:

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