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Join Date: Oct 2004
Location: Between DCA and IAD
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Most but not all UX flights use the gates in T8 (80-88). A few mainline flights do use the low 80s on occasion, and also a few UX flights use a gate or two over in the T7 on occasion (though this is IME rare).
It's not a long walk between gates in T8, and T7 is walkable in about 5-10 minutes depending on your walking speed.