Most current pathfinder should unlock all past pathfinder flying

[Peppermint-eldrethalas (Peppermint)]

@Misery-darrowmere

Pretty sure they have thought of it and decided against it.

Flying Update in Shadowlands

With the major changes coming to leveling characters from 10-50 in Shadowlands, we want to make sure that there is a navigational parity among all of the different expansions you can choose while questing. In the next version of the Shadowlands Alpha that will appear this week, testers are going to see an intentional change coming to Shadowlands for a couple of older Pathfinder achievements. Specifically, the flight training rewards from Draenor Pathfinder and Broken Isles Pathfinder, Part Two …

Eh, close enough.