US airline now offers a third gender option, X, for passengers who do not identify as male or female
United Airlines is the first airline to offer a non-binary gender option for passengers booking flights. Customers can select M (male), F (female), U (undisclosed) or X (unspecified), to correspond with gender-neutral passports that are issued by some US states.
Last year, the trade bodies Airlines for America (A4A) and the International Air Transport Association, which represent most of the largest airlines in the US, approved changes to booking procedures to include non-binary gender options. United is the first to adopt these new set of best-practice standards for carriers.