I have davened in a Chabad house at various airports. There were people wearing Ashkenaz, Sephard, and Chabad tefillin. The Chabad house had a supply of tefillin for first-timers that included Ashkenaz, Sephardic and Chabad. The rabbi would tell someone laying tefillin for the first time to follow the minhag of his father, and if the first-timer did not know, the rabbi would ask what region his non-American ancestors came from, and follow the prevailing custom of that region.
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