For flight shots of insects I've had good success with the Sigma 70-300 DG macro lens at 300mm with a working distance of around 3-4 feet. A good working distance helps a lot with flying insects, get too close and you have to move around a lot more.
The trick is to watch your subject's behaviour and stay calm. Pre-focus manually and wait for the subject to come into frame, fine tune and shoot. I found that manually focussing between leaves on a bush was a good way to improve my speed and "learn" the lens until it became second nature.
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