Great points! We're incorporating aspects of all three workarounds. Ground sync is already possible (wifi isn't available on many regional short-hop flights so

Great points! We're incorporating aspects of all three workarounds. Ground sync is already possible (wifi isn't available on many regional short-hop flights so we eat the latency), and we're discussing dedicated bandwidth with in-flight wifi providers. We've been paying the $14.99 market rate for customers testing the MVP who receive free in-flight wifi for their efforts, so the resulting cost would be much cheaper. To your last point, we load the last-known tiles expected to be captured on the flight in order to take a visual diff in the air, and then send that diff back down to earth instead of the entire image. This results in a roughly 80% savings in data but requires more hardware.