Speaking of flying, Doc recently posted a flight hacker’s guide, which travelers may find useful.
UPDATE: Thinking about this, did anybody else notice that they’re wasting a bunch of space for each circle-in-a-square? Roughly 22%, if I’m not incorrect. Mind you, water is surely a scarcer resource than land, so I’m sure the circles are a wiser approach. And maybe they grow some low-water crop in the extra 22%?