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

Related questions

1. What is basic economy on United Airlines?
2. What is basic economy for United?
3. Can I use my Ryanair boarding pass on my phone?
4. How early can you check in for a flight united?
5. Can I bring a carry on with United Economy?
6. Is there a difference in economy and basic economy?
7. How much is the first checked bag on United Airlines?
8. Is united economy the same as basic economy?
9. How much does it cost to check a bag on United?
10. How many checked bags are allowed on United Airlines international flights?

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