Colibri49
What do you define as a flight - one takeoff and one rig landing - ie a sector. If that is your definition then in the 40s in the 1990s we had 2 a/c each doing 42 sectors a day/night 365 days year or 30660 sectors a year plus one of those a/c doing an extra 10 sectors a day 365 days a year or 3650 sectors. This was a total of 34310 sectors. There were other shuttle contracts in the NNS at that time, on the Ninian and Claymore, though the 40s was the busiest. These figures slightly skew your simplistic view of accident rates!
HF