RAT5
What a load of twaddle.
If ATC give a diversion, or a hold to an aircraft do you hold the operator responsible if that diversion or hold leads to a discrepancy in schedule times, which can and often do cause effect further across the schedules?
Is it then by your assertion, a failure of the operator by it's lack of control over NATS to deliver its product, in that the operator has failed in its responsibility to ensure that it's 'agent' doesn't have the tools to do its job.
Or that an operator that operates out 'x' or 'y' airport has failed by it's lack of control to deliver its product because the airport operator doesn't have the appropriate security staff, scanning equipment, facilities that cause a huge backlog through security processing that causes passenger to miss flights or aircraft to be delayed off block.
Or that an operator cannot process its passengers within a given period due to the lack of available desks, which the airline rents from the airport operator if/when available.
Or that an operator fails to have its aircraft off blocks due to the fuelling facility having an issue with their equipment that prevents the aircraft being fuelled within the time of the turn around.