A very, very simple set of flying battleships rules, these make for a quick playing and fun suspend-your-disbelief-and-don't-ask-any-questions game.
No - they don't bother to model altitude. This would overly complicate what is otherwise a basic and simple rulesset, and their inspiration of pre-WW1 ships sailing along blatting each other in gentlemanly line of battle doesn't require it.
For the price, these are great fun rules, and if your so inclined, easily mod-able to fit your requirements.
[5 of 5 Stars!]