the title says pretty much everything. MC a flightmaster of the opposite faction to get the flightpoint (you'll want to take two priests with you, so each of them can get it)
worked for my after spamming right click onto the controlled flight master
of course, to fly to a enemy point, you will need a neutral point to start off. for example ratchet -> crossroads
also auf deutsch noch mal:
mitm priest den greifenmeister mindcontrollen und dann mit dem 2ten char den flugpunkt lernen