United Airlines announced on Friday that customers can now choose non-binary gender options, making it the first U.S. airline to provide the expanded choices. Customers will be able to choose the prefix "Mx." during bookings, and they'll have the option of identifying as male, female, undisclosed or unspecified. The airline says it has been working with the Human Rights Campaign and The Trevor Project in training employees on the new changes. Two trade groups approved a new best-practices standard last month that suggested allowing airplane passengers to use non-binary identifiers, and several large airlines have said they plan to adopt the changes in the future.

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