My article about the 50th Anniversary of the Berlin Airlift First Day Covers was published in the First Days Magazine of the American First Day Cover Society (http://www.afdcs.org/). It actually made the front cover. The hard cover has not come out yet but if you are a member of the AFDCS, you can read the article on line. If you collect First Day Covers, I would highly suggest you join the AFDCS if you haven't already.
I am attaching a copy of the cover.