This varies widely and depends on factors such as airframe, crew qualification (copilot, first pilot, aircraft commander, instructor), additional duties, world situation etc. Generally speaking heavy pilots get more hours because of the long cruise times. I would say an AF pilot who averaged 50 hours a month was doing pretty good. That would give you about 600 hours a year. I would say the average heavy line pilot is doing somewhere between 300-600 hours a year. A lot of guys have 60+ hour months but at the end of the year when you throw in the non-flying things we do for training or officer stuff you rarely see someone manage to do 60 hours a month for a whole year and end up with 700-800. I think C-17 and C-130s are probably doing the most right now (although I cant say that for sure)....