American Express Global Business Travel has updated its Neo online booking tool to give new options for non-binary travellers.
Neo's gender selection field now includes "non-binary" as an option alongside "female" and "male" for traveller profiles.
In addition, it has added the gender-neutral prefix "Mx" as a choice for travellers alongside "Mr", "Mrs" and "Ms". Companies also have the option to remove prefixes altogether if they prefer.
The TMC said the change comes as more countries are offering non-binary gender options on passports, including the US, which added "X" as a gender option earlier this month.
The latest Neo release also included a new sorting option for travellers, where they can see the options with the lowest carbon footprint at the top of their search, according to Amex GBT.