The federal appellate courts other than the fed circuit have regional jurisdiction. Their decisions are not binding authority on courts outside their own regions.
As I understand it, that's not at issue here. The rulings of the circuit and district courts are binding on actors in their jurisdictions - the FISC can't (or at least, I didn't understand it to be legal for them to) come in and rule that conduct deemed unconstitutional by a circuit court on a particular actor (ie, the Second Circuit ruling on conduct by the NSA).
