User blog comment:WolfKingDemon/Proposition: Global treaty/@comment-27822411-20140729231259/@comment-27822411-20140729231949

Remember this will apply to everyone, so even if we don't have any flying ships, no one else will either.

How about this rule.

Like with the Lv of warships, flying ships under Lv 6 can be built and bomber like ships do not count. Also, each navy can have half of the amount of super warships to their flying ships. Meaning, if you can have 20 super warships, you can have 10 flying ships. If your ship is both super and flying, it will add to both limitations.