Those of you demanding more planes in the original, or the helicopters and airliners in the original rather than separate apps, must not have read the development blog. He *wanted* to add all these things to the original, but ran into technical issues. The game ran out of memory - apparently the game has to preload all the airplanes into memory so you can switch whenever you want, and there was only enough memory for around 4 of them (he says he freed up RAM when making the airliner version, so maybe that was what allowed him to finally add the final two to the original game). And you can tell the game is already using a ton of memory, because it's one of those games that likes to crash to the Home screen if you haven't rebooted your system recently (the system does that when running low on memory).
And keep in mind, these add-ons aren't "better" than the original. The original will always get all the technical updates from the addons, and he says it may even get the advanced instrumentation from the airliner version.
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