I thought there was also a flight instructor in MN that alerted the FBI about a student with suspicious flying skills requirements.

And let's not forget that Israeli "art students" renting a house in the same area as the perps. Or the moving vans rented by Israelis that were pulled over for suspicious activity around a power plant in Georgia, I think it was. There was also another moving van rented by Israelis that tested positive for explosives residue.