Hi Geoff -
The videographer in the tower has to periodically step away from the camera to review footage, change equipment, go to the restroom, etc. When he does this, he can either pull the camera back as wide as it can go, or point it at the Jumbotron along the flightline, and he's been alternating.
As for rebroadcasting the Jumbotron feed, no - there are a number of reasons why that isn't being streamed. First and foremost, it's meant primarily as a supplement for airshow viewers here onsite - all but required for Jetman. Secondarily, our purpose with these webcams is specifically not to try to do a professional, full-blown TV production around the airshow, but to give people a simple, DIY-style look at what's going on here at Oshkosh. If people really, really want a good look at the airshow, among many other things, come on out and see us!
Speaking of which - how's virtual Oshkosh going?
Cheers -
Hal