Check-in at the check-point, the airport officer checks your document. To confirm your identity when you are true. Otherwise, you will not be able to gain access to the inside.
Check-in check-point Airport officials will serve to review your documents. To confirm your identity, that is true or not. Otherwise, you will not have access to the inside.
Check-in check-in in point The airport staff is to check your documents. To confirm the identity that is you or not. Otherwise you will not be able to enter inside.