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France. they changed rules to accommodate that possibility. >> this year the addition of these very large sand filled trucks to block off all intersections to prevent someone from getting on the route with a vehicle was an add-on. during the last two years, we created two new units that are specifically assigned to the parade. those are heavily armed officers you described with long guns and tactical gear and the addition also of the dogs. the vapor wake dogs they call them. they walk along a crowd line and sniff and detect a potential explosive. it's a shame that we have to go to those length...

Terrorist-related activities have certainly added a new element. >> look what happened in nice, france. i know they changed some of the rules to accommodate that possibility. >> right, this year, the addition of 80-some large sand-filled trucks block intersections to prevent someone from getting on the route is an add-on. over my time as commissioner, we created two new units that are specifically assigned to the parade. those are the heavily armed officers you describe with the long guns and the tactical gear. and the addition also of the dogs. the vapor wake dogs, they call them. they're goi...

Awareness, of course, understand where they are relative to the crowd line, understand if there's any wind drift that's pushing them along, so they are busy processing a lot of information in a very short amount of time, as well as trying to keep the flow of the air show, the flow of their sequence of maneuvers, and remembering what's next. it's a very intense environment. >> the maintenance we do on the airplane is far beyond what the normal airport is subjected to. i mean, we go over these airplanes with a fine-toothed comb. we replace parts earlier than we normally would, and in our trainin...