Larger Fleet Size - Age of Z Origins - Hunter Training Archive 

Age of Origins Training Content
Learn to build a stronger city.
Basic Ways to Increase Fleet Size:
1) Garage
2) Leadership research
3) Reactor (Equipment)
4) Officers
Okay there are a couple more but they aren’t included here:
5) Island decorations (often at level 6 or 12)
6) Unworldly Stats (6-Star officers)