I'm not as familiar with the technical details, but it would be something that would be created by the airport authority in conjunction with the air carrier partners in that airport. Airports vary quite significantly from one part of the country to another in terms of complexity. Airports have plans for all kinds of contingencies, from security incidents, to safety incidents, to irregular operations. They try to think of the needs of travellers in that type of situation and to predict what might be needed. In some cases, it may be buses to get travellers off an aircraft, snacks and food that can be brought out, maybe cots, and that sort of thing, but it would vary. I'm not personally familiar with the details of that particular airport's plan.
On September 14th, 2017. See this statement in context.