From: Charleston, SC. USA
To gain experience while in home airfields, don't just use training. Set your naval attack planes (DB, TB, LB) to "Naval Attack", then set "train" to 40 and "ASW" or "Search" to 40. The aircraft unit will fly missions, gain experience points in "experience, NavB or NavT, and ASW (or search). You get three for the price of one! For fighters, set them to escort, cap to 40, and training to 40. Your fighters will fly missions, and gain experience points in "experience" and "air".