John Lahart (Dublin South West, Fianna Fail) | Oireachtas source

I have been given a scenario. Is this a regular occurrence or is it completely out of the question for a dispatch system to send a crew on call from County Donegal to County Tipperary that is diverted en route to Mullingar, then to County Mayo, and then to County Donegal? Is it completely out of the question that this could occur?