RE: 400 feet limit?
Advisory?
So they are only Advising not to hit a GA or Comercial?
Why not go hit one, and just sit back secure in knowing it aint illegal, they got nothin on you.... it was just advised to avoid them.
OK, hitting one would wreck the model, just fly in front of GA and make them yeild... if you think the FAA is only advising that RC yeilds to GA.