As far as I can tell, if your formation has been intercepted by a credible defensive force, this should satisfy the T+60 rule regardless of time/vacinity to your attack area. Now I don't think this should be misinterpreted as saying that you can fly wherever the heck you want and as long as you're attacked, it's fine. I still think there needs to be intent added to the equation, but other than that, I think the 'attack' begins the second you come under assault.