Both can be correct depending on the situation Where's John? he's at the airport Have you arrived to(at) the airport yet? yes I'm in the airport right now looking for you IN = a building AT = a place but these subtles differences can be hard to grasp at time and can be very intuitive

Merhaba Kübra, memnun oldum :) The answer is both! In the airport > specifically INSIDE, for example: "there are 1000 people working in the airport" ..they are inside the building, with a roof over their head At the airport > generally there, but not under the airport's roof, for example: "There are 10 airplanes at the airport" Sometimes you can use one to be more specific For example: Your friend calls you. "Where are you? Are you in the airport? I'm outside by the taxi" = specifically IN the airport, under the roof OR Your friend calls you "Hi, did your flight arrive on time? Are you still at the airport? Or are you in the taxi?" Summary: "In" = there is a roof over you or it "At" = general term, not necessarily "inside" iyi şanslar!

saying at the airport would probably be more common even though you are literally "in" the airport.

Both are correct !!!!