Airports missing from facilities request

Hello,

I'm building an app that shows the airports, ndb, and vor within the area around the aircraft. I'm having a problem that some random airports are missing and I can't figure out why. I compiled the code from Microsoft's sample here:

http://msdn.microsoft.com/en-us/library/cc730341.aspx

and I am seeing the same behavior. It looks like the NDB's and VOR's are accurate when I request them. I found a similar thread from 2007 but there were no replies

http://forum.avsim.net/topic/224183-simconnect-airports-missing-from-list/

and I'm just wondering if there is any way to get around this issue and return all airports. Clearing the cache is not working for me. Here is an example from one of my customers:
 

"I was flying on Oahu, from Dillingham to Honolulu, and there were NO local airports at all.

Around SeaTac, FSX picks up a lot of "Area" airports, including one fictitious one (KEWL, Emma Field), but is missing KPWT Bremerton. The Bremerton VOR and NDB are correctly returned."

 

It does look like this issue still exists in Prepar3D v2. I'm hoping there is some magic incantation that can fix this.

Thanks