Talk:Spring 2016 Event/@comment-203.144.144.172-20160513022356/@comment-28375986-20160513033858

E-5A is the best place to level your land-base planes. Go in with 1 Submarine and send all the planes to the first node. Then retreat. That's what I do and it always works for me.

Unless you're experiencing a bug where your planes in your land-base won't level up. It'll be fix in this patch tho. So try again after the maint.