The correct spelling of what the American's call 'airplane' because they can't be arsed to pronounce it right. The same general rule can be applied to most of the English language that they've decided to take over. See also colour.
1) The aeroplane took off from England, flew to America where it became an airplane and ceased to exist.
2) OMG, what's with those silly American fags renaming their own inventions (and ours..)?