Please be more specific next time ...
You are lucky I'm still lurking here (unlike some campaign FREDers - no offense intended of course) and can still give advice on missions which are four years old
If I can make any sense of the mission right now from notepad - The Asgard (an EA Skylark) is arriving once you have reached the first nav beacon in the mission ... once you reached it (and it disappeared) you only have to wait until the transport shows itself
@Vidmaster:
He is referring to one of my very old missions - from the time I was makeing that PSI Corps campaign of mine...