this will only work when your within a certain amount of time of the landing zone. not sure what the max time is. for example. i was at the nek station and was headed to the wailing caves. when i was flying over the wailing caves i right clicked the top part of the window and waited about 15 seconds (for the griffon to actually get to the landing zone) after i clicked back in i was floating in the air right above the wailing caves.
if anyone knows the max amount of time that you can right click the top of the window before getting logged out then thats the max amount of seconds you should count from the station.
two things you have to be careful of: 1. make sure your not to high from the ground or else when you fall you wont surive... 2. make sure you dont hold the window for too long or else it will just zone you to the character select screen and youll have to wait some time before you can log back in cause it will gove you the 'account already in use' box and also when you log back in if this happens youll be at the station at which you started.
The last oh 5 or so times I rode the griffen and he would "Drop me off" at the tower I always ended up out in the middle of the air a good bit away from the tower. I always did the super jump to make it to the tower so i didnt take a bunch of damage for falling.
i just tested it out and you can STILL jump off the griffon using the technique described above. not sure if the distance has changed or time but you can still do this
MOD please test this for yourself and see that it hasnt been nerfed - thanks