What would be the reason small 2 seater planes fly above Perth at 2 am?(both)

There is always one or two planes flying at this hour every night.
What would be the purpose?

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PiecingBabyFaceTogether · 31-35, M

No idea.

Gusman · 61-69, M

@PiecingBabyFaceTogether Me neither.
I heard it again this morning so I viewed the airport traffic radar and it was not there. 🤷‍♂️

PiecingBabyFaceTogether · 31-35, M

@Gusman That's weird. I never seen a small plane in the sky in the countries I been to. It's either civilian planes or army helicopters and sometimes jets.