No, you should never be late to a delayed flight; you are still required to adhere to the original check-in and boarding times. Airlines explicitly warn that a delay can be "shortened" or resolved faster than expected—for example, if a mechanical fix is quicker than estimated or a crew member arrives early. If the airline finds a way to depart sooner and you are not at the gate because you assumed you had extra time, they are legally permitted to close the doors and leave without you. Furthermore, check-in counters and bag drop desks usually follow the original schedule and will close at their pre-determined times regardless of the plane's new departure time. In 2026, with many airlines automating their "Right to Care" and delay compensation, they strictly monitor passenger presence. Being a "no-show" at the original boarding time could also disqualify you from receiving any delay-related compensation or vouchers, as the airline can argue you weren't ready to fly when the aircraft became available.