Which terminal is my airline?

Where these numbers come from

We poll Incheon International Airport Corporation's departure API about every 10 minutes and store the flight number and terminal exactly as given. The first two letters of a flight number are the marketing carrier, not the operator, so a codeshare seat departs from the partner's terminal while still carrying that airline's flight number. For the major carriers the answer therefore comes from official guidance checked by a person; for every other airline it is still counted from the last 7 days, whichever terminal dominates.

Seven days, because one day alone swings with weather and cancellations, while thirty days would keep pointing at the old terminal for a fortnight after an airline moves. That is not hypothetical: Asiana moved to T2 on 14 January 2026, and a hand-typed page here kept sending readers to T1 for eight months.

When the evidence is thin (fewer than 5 departures in 7 days) or split between T1 and T2, we give no answer and mark it “needs checking”. If today disagrees with the weekly pattern, we say the airline may be moving. A carrier with a verified terminal keeps that answer even when the records disagree, but the disagreement is shown, with the counts.

Check-in zones are read from the counter field in the same departure records when it is present. When it is not, a hand-verified value is shown with its source and the date a person checked it.