I agree, fltplan is great, but sometimes the perf. numbers are kind of off. When I fly the CE-550, sometimes it'll file me at 375 knots true. HAAHAHAHAAHA!!!!! On a REALLY GOOD day, I might get 360. Maybe. And when I fly the Encore, it'll file me at something like 390 or so when I get in the 40's, when the airplane will do 420 or 430 all day long. Hell, you have to pull the power back on cool days to keep the darn thing off of MMO.