In fact, the missed plane ticket is not necessarily invalid. We can find the staff in the relevant window of the airport to confirm the missed flight, and then change the tickets we missed. We just need to wait for a while before we can travel by plane normally.
It should be noted that the check-in time should be before noon the next day of the flight corresponding to the ticket. If we don't check in once or change our tickets before the flight takes off, we will have to pay a certain handling fee to continue our normal flight.