Hubilub said:
There's always the plot hole of "How the hell does the mountains float?"
Which I'm still waiting for to be answered.
Because it's a completely different planet, and things work differently, physics wise. After all, they've already established that the entire planet is a giant neurosystem, so it's obvious that physics works slightly differently on Pandora.
However, it's probably something to do with a massive magnetic field, and high levels of magnetic material in the mountains themselves, keeping them afloat. It's like trying to put the same side of two magnets against each other, they just won't touch. That would also explain why all the instruments on the aircraft go offline.