The term "check-in" refers to the process of announcing one's arrival at a specific location, such as an airport, hotel, or event. At airports, the check-in process enables passengers to confirm their presence on a flight, obtain a boarding pass, and, if desired, check in luggage onto a plane. This can be done at staffed check-in counters, through self-service kiosks, or online. Online check-in typically starts 24 hours before departure and allows passengers to select seats and print boarding passes, thereby avoiding potential check-in lines at the airport
. In the context of hotels, "check-in" involves guests providing or confirming personal information, including contact details, and often requires a signature
