Check-in is usually the first procedure for a passenger when arriving an airport, as airline regulations require passengers to check in by certain times prior to the of a flight.
For international flights, you are to present a passport, but for domestic flights only a photo ID is usually .
The airline agent will ask you if you want to check luggage, or if you just have carry-on .
Large or heavy suitcases and bags will have to be , and go in the aircraft’s cargo hold, but you can take bags or cases with you on the plane as long they will fit in the overhead bin above your seat in the plane’s cabin.
If you the size and weight limits specified by your airline, you have to pay an excess baggage charge.
After the agent you your boarding pass, you can go through security and make your way to the gate that to your flight.
Eventually, your flight will be called and you can the plane.