These Phantoms were taxiing towards me from the ramp and they headed out to depart.  As the came along the taxiway, I got a moment as they started to merge from my position and, briefly, there was a moment when one was hidden behind the other with the exception of the wings.  For that second I had a Phantom bi-plane in front of me before the effect was gone.  I consider this the rare Phantom II/IV!