How do I check in at the airport for an international flight?

Related questions

1. Can I check in online for an international flight?
2. Is food allowed in checked baggage?
3. Can I take water on a plane?
4. Can I use my cell phone on a plane?
5. Does Korean Air have Economy Plus?
6. When can I check in Korean Air?
7. Do they check weight of carry on luggage?
8. Does Korean Air have premium economy class?
9. Does Lufthansa check carry on weight?
10. Can I pack food in my checked luggage for an international flight?

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16. #customs
17. #international