Talk:Spring 2016 Event/@comment-28251657-20160508212121/@comment-99.247.59.53-20160508232438

Also, in case you weren't aware, you can train proficiency on land planes by sending a sub to E5 node A, sending all your squadrons to support node A, then immediately retreating.

You incur no repair costs, since node A is all subs, and subs can't damage subs, and there's no base raid or AA at the first node, minimizing repair costs for your land squadrons.

Training your land squadrons should considerably boost performance.