I'm going to have to call shenanigans since I've taken the flight from IF to Sunwell Isle about 10 times now with no problems; however, if something did in fact go wrong go ahead and post any details you have in the Bug Report forum.
Does your computer take a long time to load new zones? That's the only thing I can think of even possibly causing it. In any case, those would be details to post in the Bug Report forum anyway.