Hi Danny, whatever you saw - and I truly believe you saw it - only tells me it's not intelligent and certainly not alien in nature because what would the point be in flying in exactly one line and turning 90 degrees in midair while you could have taken a shorter route over the long side of the triangle. It's not like they were driving through Manhattan. And to assume 'they' did some nifty flying exercises over our planet for teaching purpose or just for fun is too much of an 'out there' assumption for me. But what it could have been, I think really not a single person is able to answer that question.