As I haven't seen them all I assume that mentioned regs have also been here... that being said I found the following for you:
Polar -> N355MC
DHL 757 -> OO-DPN and/or G-BIKK
Grey ATP -> Westair Europe, LX-WAS
Israel Cargo -> 4X-AXF, or referring to the white 747 on the other side of the field, in that case it's N134AP
Second United -> N657UA
Hope this fills up some gaps for ya
Grtz, John