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Two airports in, the great-circle distance and an honest airborne estimate out — cruise speed and climb allowance stated, so you know exactly what the number is and isn't. Schedules pad; physics doesn't.
Set what you want and the result appears as you go. Nothing needs uploading because there is nothing to upload — you are describing what to make, not sending us anything.
Your browser does all the work locally, using your own operating system where randomness is involved. Nothing is requested from a server, so nobody else has a copy of what you made.
The answer appears on this page as you go. There is nothing to download, because the answer IS the page — screenshot it or write down what matters. Nothing is kept — refresh the page and it’s gone, so take what you need before you leave.