Where's My Suitcase

Do you like to travel on a holiday?? to celebrating a holiday usually many people choose to traveling. whether by plane or even by a car, when you choose to travel by plane, you have to go to the airport, after check the ticket and the next step is to put your luggage or even a suitcase in a baggage.. here see the picture in the left?? how's that happen?? are the airport don't pay the porter