I was involved in the QBF in 98. It should have been cancelled before take off, but the leader didn't want to throw away the 3 months of planning and coordination that had gone into it. It resulted in a near miss between 4 jags and a Tristar (all IMC) directly over Buck House. There were two formal debriefs and an IFS investigation. The rules for multi aircraft flypasts are quite clear and the cloud base in particular gets more stringent the more ac involved.