I checked the runways. The only way to fix this problem is to open the airfield texture in a graphics program and rotate it maybe 10-15 degrees so that its runway will line up with the takeoff waypoints and "runway ground" red arrow".
The "Runway Ground" red arrow is the key to this problem! Planes will line up on its axis...it does not matter where your runway takeoff waypoints are...as you can see in the pics above. The red arrow must line up exactly on the takeoff waypoint line if you want the planes to line up exactly on the takeoff waypoints.
Sometimes and easy fix is to rotate the red arrow with the numpad 9 or 7 keys. The Red arrow axes has limitations and rotate only particular degrees. You just have to try and line it up onto the texture's runway as best you can. agracier, rotating the texture should be easy enough for you.
Both airfields (Woodlark and Trobiand) have this same problem.
also...
Woodlark's "STAY" points may be too close to objects (camo nets/buildings). If they are too close then the plane will pass that point and go to the next one. If other working stays are already taken by planes then the taxiing plane will just disappear. So make sure the STAYS are in good location and that there are several of them available. You'll just have to test them with the landings of several airplanes in one mission.
Trobiand's does not even have STAY points. Just need to attach some STAYS to the TAXI points and make them park in spaces far enough away from objects as described above.
And, if TAXI points are too close to objects they may not work. Be sure objects are far enough away from the taxi path.
One other thing I noticed is that there are trees in the water on the east side of Bomapau isle. I don't have the latest update so maybe it's corrected already.???