In a message dated 10/28/2002 10:41:14 AM Central Standard Time, exatc@neo.rr.com writes: > Maybe extra section > ATC Computers would not permit two identical Aircraft Identifications > (ACID)in the system. It also is done when the original light is so late > that they start another aircraft on the route segment rather than delay all > the boarding passengers. Several other options but this ounds the most > plausible to me. My WAG would be the D stands for delayed. > > Al > I don't know if the D stands for delayed but I will tell you one experience. In my freight dog days we had some funky stuff going on one night. I was in GRB (ZMP) and another pilot at MDW (ZAU) picked up a prefiled flightplan with my number to go to MKE. When we got in the same center airspace (ZAU) the computer had a "little" problem, solved by changing one to end with A (alpha). Identical IDs are best avoided. Airports: GRB=Austin Straubel/Green Bay, Wiscoinsin MDW=Midway/Chicago, Illinois MKE=General Mitchell/Milwaukee ARTCC (Air Route Traffic Control Center): ZMP=Minneapolis Center ZAU=Chicago Center Jim Hann Waterski J-41 Captain Lambert-St. Louis Airport (STL/KSTL)