Originally Posted by Night Flyer

Bear in mind that gate assignments between T2 and T3 seem to still have a bit of random-number-generator aspect to them, it's not uncommon for the app to show me a T2 arrival on takeoff that turns into a T3 arrival on landing, and vice-versa. Or to show a T2 gate the evening before and a T3 gate closer to departure.

So unless your flight is tonight you might not end up out of T3 after all. And even then . . .