The Transportation Security Administration said it will update the PreCheck Program to include an "X" gender marker option on its application, but the agency did not provide a date.
A new "X" gender marker on US passport applications begins April 11.
Later this year, TSA will begin using scanners with new technology that will replace gender-based systems and are intended to "advance civil rights and improve the customer experience."
The TSA will work with airlines to promote the acceptance of the "X" gender marker and will also update the guidance for airport security screening officers to remove gender considerations when validating documents, DHS said.
Due to the way full-body scanners at airports work, transgender travellers have previously accounted for a disproportionate number of issues at screening. For some, this has resulted in humiliating searches.
"The TSA uses millimetre wave scanners at checkpoints. The scans are processed by an algorithm that compares your body to a 'typical' male or female body," wrote American journalist Lucas Waldron on Twitter.
"If your body doesn't line up with the algorithm's programming, then you will be flagged for a pat-down," they wrote.
Issues around travel and gender aren't just being challenged in the US either. In December 2021, a British activist lost a legal challenge at the UK's highest court to the government's policy of not allowing gender-neutral passports.
— The Associated Press with additional reporting