In 1998, I worked for a while on the flight cancelation software for United Airlines. The number of factors that come into play in determining which flights should get canceled for, e.g., bad weather is fascinating (flights are always canceled in pairs so that planes and crew won’t have to deadhead to be where they need to be). The one that sticks with me the most was that having a high-milage frequent flier on a flight would make that flight less likely to be canceled.