Dirty Tricks(not always) If you don't want to attack a terror site, then land at it, then abort right away. If you skip it, then you loose alot more point(1000)
If there is a terror site you can't/don't want to go to just send an interceptor there, as long as a craft is en route to go there the terror site can't dissapear. This is great if you don't a night mission.