As Guy Edwardes, an expert nature photographer says in his book, 100 Ways to Take Better Nature and Wildlife Photographs (David and Charles ISBN 978-0-7153-3149-1), “One of the most challenging techniques to master in wildlife photography is photographing birds in flight”.
I found that out when I began trying to capture my own pictures of birds on the wing. Eventually I did succeed and the results of my learning curve were put together as a new e-book. How to Photograph Birds on the Wing is now available and may ease your way through the pitfalls that I found.
How to Photograph Birds on the Wing is available in formats for tablet readers at Smashwords Here
it is also available for Kindle readers at Amazon stores.