User blog comment:Tabby the Hedgehog/A question.../@comment-1824272-20121009184043

I'm completely different from everyone else here. Personally, I say you should play Ace Combat 04 first, then go to Ace Combat 5, then go to Ace Combat Zero. It's like Star Wars, because of the whole prequel thing with 5 and Zero.

Of course, this is up to you; if you want to play through it chronologically, it's Zero -> 04 -> 5 (if we're just talking about the PS2 games). If you want to play through it in order of release, it's 04 -> 5 -> Zero (again, just talking about the PS2 games).