Spawning at POI, Able to set altitude, How to set heading

Hi all,

Using SDK, I am able to create a Landmark object, and define an Altitude to spawn.
When I set that POI as departure, my plane pops up corectly at that altitude.

How do I make the airplane pop up at a predetermine heading.
(I know I could just slew the plane, but I was curious if there a way to specify the heading of a plane when it spwan)