Second Eye
One thing Roland doesn't use often and is really op is Hummingbirds ability to reduce weight. It could be use to move ridiculous amount of soldiers, canons with Lightning. You pack everything on steel platform, apply magic and Lightning/Maggie takes it to destination with ridiculous speed. It could be used in emergency situations for first plane attempts (to save plane of course, for saving people we have Lightning) as there is no way to design plane with no flaws on first try.