I am very good friends with the CP at MWR and they use outside vendors for perf data. My point is few 91 operators will use it. As a former PIC on a CRJ the g whiz stuff only goes so far then one has to go with reality. If you think load plan is wrong and pull out the PDA for your argument, you first mistake will be to pull out the PDA. I wish I could program an APP like that. Many kudos! But regs and laws are just that. Lawyers are every where. Part 91 is fine, anything else is too risky....