It has taken the better of Five months to post this message. I flew many times with the C172 instructor. He was the utmost professional pilot. The type of instructor pilots could go to get any help they needed. From what I understand the ATP instructor was of the same caliber. The alert area west of FLL is like the Battle of Britian, I have over 1700 hours of dual given in the area. I lost track of all the near mid-airs. I know that they where using air to air and visual scanning. RIP to the four and don't ever forget them. They paid the price to remind us all that all the vigilance in the world may not be enough. One tip for CFI's, after awhile I begin to have my students fly odd altitudes 2300, 2700, 3100, etc when I was onboard. Saved my butt more than once, seems like everyone is at 2000, 2500, and 3000 feet. Gold Seal CFII, MEI, AGI