Alot of people I know think "airtime" is when the car literally jumps off the track. I had one friend who was 100% convinced of this and wouldn't ride any coaster with a hill.
Well I'm not too sure about the track(It looks exactly the same). I don't think any supports were installed though. The more complex ones (the next one) usually are up quickly.
1. It is called a wing over drop.
2. That is a matter of one's opinion.
3. I can.
4. Yes and no. Keyholes are becoming more popular on wing coasters, although this type is new. (expect every wing coaster to have a unique keyhole element)