Does anybody remember a webcomic with flying ships that act like battleships, world leaders talk to cats or panthers who are spiritual guides, teens fighting a war that looks like world war 2... but with big flying birds on one side and technology and big flying battleships at the other?
It's more World War I technology than WW2, except for a scene set in a more advanced world (equivalent to current Earth) where two of the cast are playing a MMO war game.
The side that has the biplanes has deployed from flying ships:
The biplanes are fighting an enemy that mounts giant feathered fliers.
There are telepathic cats that may be panthers that act as leaders or advisors (they are addressed as "Lord" by lower classes, but treated by leaders as equals).