It's just an FS9 rendering issue. Happens at every airport, but it's not easy to notice, because you need to have the airport located very close to a steep change of elevation.
If you go close to PHNL, and look toward the other airport across the mountain, that is PHNG (Kaneohe), there'a a spot where it's shining through the mountain.
The screenshot below is from the *default* Innsbruck in FS9, the whole airport + runway shines through the mountain. Of course, with PHNL being so much bigger in size, it's also more noticeable.
The problem doesn't happen in FSX.