Travel books with some US airlines will eventually be offered new gender opportunities.
The adjustment will give passengers alternative choices when booking their tickets, The Associated Press reported on Friday.
The modification is being implemented as a means of promoting inclusivity, according to the airlines.
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"Not disclosed" or "unspecified" will apparently be among the new options available.
The booking tools used to arrange flights on US, Delta and United airlines are currently being restructured with the new election, which is expected to change in the coming weeks, they told The Associated Press.
Spokesman American Airlines Matt Miller was optimistic about the rollout while he noted that the company has "a very diverse customer base."
United Airlines is planning to let people choose M for man, F for women, U for not – uncovered or X for unspecified From the gender menu when ordering a ticket on their website or mobile app, spokeswoman Andrea Hiller said the outlet. They will also have the opportunity to pick "Mx." as a title.
United also tweeted about their plan to give customers the opportunity to "select the sex they are identifying during the booking process."
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It is also expected that a non-alternative alternative will be made available to flyers who buy tickets on Delta and Alaska airline flights, company associates The Associated Press says.
US and international airline trading groups recently approved a new standard recently dealing with customers with "non-binary" IDs. The standard, which is not mandatory, but more as a guide, comes into force on 1 June.
Associated Press contributed to this report.