A few days ago I had to take a flight and forget to check-in. Luckily, I was able to check-in at the airport but I wondered why check-ins are required at all i

A few days ago I had to take a flight and forget to check-in. Luckily, I was able to check-in at the airport but I wondered why check-ins are required at all in 2022. The answer is unexpected. TLDR It's how most airlines get paid for the flight.