But niknak, without local authority fire cover, everyone is at greater risk. But airports - and some factories - are far better placed than most businesses because they have their own fire services.
As far as airport fire cover is concerned, yes airport fire services are intended to knock any fire down for long enough to get everyone off the aircraft. If the wreckage burns out afterwards so be it but the AFS will have done their job and that's what they are there for.
On Fire Cat available, it's quite simple. If the AFS are able to respond to a call out with the minimum require minima then the airport has cover - if they can't do this (and it doesn't matter how many local authority five crews there might be hanging around), then there is no fire cover and operations that need fire cover should stop.