Can I say: 'He is in the airport' instead of 'he is at the airport'?
I believe that the preposition "in" cannot be used with "airport" alone except when we have another noun (usually a building in an airport) after it.
He is waiting for me at the airport. (Here "the" means both the speaker and the listener know which airport.)
He is waiting for me in the airport lounge.
NOT A TEACHER
Usually we say "at the airport" to say that, unless we want to be specific about exactly where we are as in theeexellence's example.But if I want to specify that he is inside the airport, as opposed to out of the airport?