I subscribed to "Over the Front" for 2 years, and it is definitely an excellent publication. My interests, however, lie mainly with the aircraft of WWI and earlier. Unfortunately, I'm on a rather limited budget, and I've found that "WWI Aero" published by World War I Aeroplanes, Inc. more closely mirrors my interests. This is not to take anything away from "Over the Front" or "Cross and Cockade", but merely to highlight another fine publication that focuses mainly on the aircraft of WWI and earlier.
http://www.ww1aeroplanesinc.org/
Mike