STUMPERS CCLXXIII

Can you think of four related words that could describe flying in an airplane above Australia?

HINTS:
1. The four words are made up of two sets of opposites.
2. All four words are the same parts of speech.
3. All four words are prepositions.

Answer:

UP ABOVE DOWN UNDER

Credit:
JUMBLE puzzle
David L. Hoyt and Jeff Knurek