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If you're booking a one-way flight, there's a check-in counter problem almost nobody warns you about: some countries require proof you're actually going to leave before they'll even let you board. Airlines get fined if they fly you in without it, so places like Thailand, New Zealand, and Costa Rica check routinely — while most of the world never asks. A quick check before you go tells you whether to book a refundable return ticket as a cheap safety net.