What does "check-in closing time" refer to ?

Heures limites d'enregistrement et d'embarquement

 
The check-in closing time is the time after which check-in is closed. This is set to one hour before long-haul flights and all flights to Israel and 30 minutes before mid-haul flights.
Beyond this limit, you will no longer be accepted to board even if you have a valid ticket.

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