There are no iPhone retailers at airports in the US. Given the shortage of iPhone X, I don't think you are going to be able to order one and get it anytime soon. Mail orders are 3-5 weeks, and pickup at an Apple store cannot even be scheduled if a store does not have any devices.
I would suggest you to ask for help from a friend who's staying in the US.
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You're welcome. If you have a friend in the US as the other person stated, be advised at this point, Apple has not released a SIM-free version. Also, you have to be concerned about which version of the phone will work with the LTE bands in your country, and the warranty is not international. If there is a problem with your phone, you would have to bring it back to the US for warranty service.
Question: Iphone X