An issue of this comic went up for sale on eBay immediately after the episode aired, and while bidding started at 99 cents, it now is up to almost $200. Go see a bigger picture of it here.
As suspected, the horrified man is looking out of an airplane window (under the window you can see an airline logo) and he's seeing a mysterious city, with one version of it floating above another. As we all know, Darlton loves to stick in red herrings, so they're probably just helping out the dude selling the comic on eBay right now, but since Locke's been asked to move the island, this image of one version of the city above the other is interesting. It also speaks to the idea that Ben and John are two versions of the same life, with some diverging paths.
Also, we only see four fingers of the guy's hand... could this be pointing to the four-toed statue??? (Yes, I'm being sarcastic now...)