According to Wikipedia, the movie Airplane! is called Flying High! in Australia, New Zealand, South Africa, Japan, and the Philippines.
I have looked online for some reasonable explanations as to why this is so, but nothing seems like a reasonable explanation. One explanation is that the word "airplane" is actually "aeroplane" in some of those countries. However, this doesn't explain why it isn't called "Flying High" in Britain. Another explanation is that before the movie was officially released, it was tested for audiences under the name "Flying High" in those countries. Apparently, it stuck.
Does anyone know if either of those explanations is correct? Or is there another reason?
Just thought I would add this interesting tidbit: I recently noticed that Netflix in Australia calls this movie Airplane! and not Flying High.