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When I asked David Fankhauser, a former pilot, if he thought it was possible that a casual hobbyist could, equipped with flight apps, truly identify (and perhaps solve) a problem for a live aircraft, he said no, probably not. "There are something like three to 5,000 commercial flights per day in the United States, so the needle in the haystack thing aside, I'm not sure the casual hobbyist possesses that type of expertise. Most aviation accidents or problems occur in a very short period of time."So while it's doubtful that someone could help a plane in real time, it doesn't keep theorists from looking. Some follow the private jets of celebrities for fun (Donald Trump, not shockingly, blocked his aircraft from being tracked), others think they've stumbled upon irregularities that turn out to be, well, just regularities. But every so often, something truly unusual will show itself. Good thing someone is watching.Follow Sarah on Twitter.