With a single ticket from one airline or alliance and electronic check-in, remaining in the transit zone is usually possible. However, if flights are with different carriers, exiting to the general airport area at IST for re-verification of visa and baggage may be necessary, even with electronic check-in. Turkish security personnel can be rigorous, sometimes demanding paper boarding passes. For flights to visa-required countries like Greece, visas and return tickets are frequently checked. Carrying printed documents is recommended to avoid complications.
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