Thread:SlyCooperFan1/@comment-1713909-20160913104853/@comment-1713909-20160913115550

Further investigation has led me to believe a truth.

There are two types of unlocks in the game: I'll dub them "Solid" unlocks, and "Liquid" unlocks. inb4 metal gear joke

Solid unlocks are unlocked strictly in a single mission. For example, the R-101 Delphinus is unlocked strictly by A-ranking (I believe) mission 05, Scramble. I note this because I unlocked this plane on the same mission in both playthroughs, regardless of the difference noted in my first message.

Liquid unlocks are the anomaly that I was confused about initially. I believe are determined by how many A ranks you have. For example, A-ranking six missions will net you the R-201 Asterozoa]]. I'm fairly certain the F/A-32C Erne is also a liquid unlock. Exact numbers will be determined as I continue to play the game.