hoi4 how to upgrade planes ¨ hoi4 tanks/armor upgrade/refit Guide • How to Upgrade Tanks i... hoi4 Upgrade Ships - Easy Guide: • How to upgrade ships i... hoi4 how to upgrade planes • How to upgrade planes ...
There are 2 good strategies for the planes: Cheaper planes to spam them as much as you can or big meta planes that takes longer to build but are more useful against small enemy air force.