Disclaimer: Excuse my bad english. I'm swedish. And this is the "international" version of the swedish one - www.FlygTid.se. Bare with me!
Q: "How do you figure out the flight time, and do you account for takeoffs/landings"
A: Hi there! We calculate this on historic flight time data. The flight time we show is only the actual flying time - with landing and take off! This website is kind of new. Its based on the swedish version www.flygtid.se wich we also run.