United Airlines has become the first U.S. airline to offer people non-binary gender options when booking a flight.
The airline has announced that passengers will be able to select the "Mx" title.
This means customers can identify themselves as Male, Female, Undisclosed or Unspecified.
The airline has worked with LGBTQ organizations The Human Rights Campaign and The Trevor Project on training employees in conjunction with these updates. Such training includes the use of preferred pronouns.
In a statement United's Chief Customer Officer Toby Enqvist said:
"United is excited to share with our customers, whether they identify along the binary of male or female or not, that we are taking the steps to exhibit our care for them while also providing additional employee training to make us even more welcoming for all customers and employees".
"By providing non-binary gender selection for ticketing and the gender-inclusive honorific 'Mx' in user profiles, United Airlines is taking an important step forward for non-binary inclusion," Beck Bailey, acting director of the Workplace Equality Program at the Human Rights Campaign, added in the same statement.
