My son has just started flying for a regional airline and he has informed us that we, his parents, are getting flight benefits in the form of riduculously cheap fares. Only thing is, as I understand, we can do this but on a space available basis - kinda like standby. I figure if I could predict which flights are notoriously sparsely populated that we could always get on a flight which would make travel planning a lot more sure. Does anyone know of any statistiscs or ideas that could help me determine this for the major airlines? Also, anyone know of discussion groups for this sort of thing - flight benefits secrets, etc.