Presumably this is the Emirates A380, on a USA tour before it goes into service.
Although why the A380 would need fire crews in attendance I have no idea
I was at the Farnborough air show in '06, where the Engine Alliance were giving out frisbees with their logo on them. The guy at the stand kept saying "help yourselves - it's the only thing of ours that flies!"
You pays yer money, yer takes yer chance...