I nead check-in namber. - Airlines

https://www.southwest.com/early-bird/

It confirms your check in and may grant you better choice of seating.

Most airlines if you go into "manage my booking" it will show you if you've got extra checked bags booked already. https://forums.moneysavingexpert.com/discussion/6359942/checked-baggage-not-showing-on-boarding-pass

https://efultimatebreak.zendesk.com/hc/en-us/articles/215702538-How-do-I-check-in-for-my-flight-and-get-my-boarding-pass-

https://www.united.com/ual/en/us/fly/help/faq/online-check-in.html

https://www.cheapair.com/help/flights/how-do-i-access-and-print-my-boarding-pass/

https://efultimatebreak.zendesk.com/hc/en-us/articles/215702538-How-do-I-check-in-for-my-flight-and-get-my-boarding-pass-

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