Quote Originally Posted by Magistrella View Post
The Spreadsheet got a confirmed entry of SC22 unlocking from SC21 - so yes, noone has said that 22 unlocks from 20 because its 20->21->22 ^^
In my case if you looked at my screenshot, the airship was on a solo trip to 20, and unlocked 22. No 21 involved (though I already have that unlocked) so that unlock is not so linear.