What happens if you don't check in for a flight online?

Related questions

1. How early can you check in online?
2. Can I book a flight online and pay at the airport?
3. How much baggage is allowed on Alitalia?
4. How early can you check into a flight online?
5. How early can you check in online for a flight?
6. Is it cheaper to buy flights at the airport?
7. What happens if I don't check in online Ryanair?
8. Do you have to check in online?
9. How strict is Alitalia carry on?
10. Can you check your bags early at the airport?

Tags

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15. #europe
16. #airlines
17. #check