I didn’t get a good look at it, but there is a plane parked over at Fairbairn.
It’s about Boeing 717 size.
The livery on the tail looks like a cross between Lufthansa and Singapore Airlines: It is in Singapore Airlines colours, but the stylised bird is more like a horizontal version of the Lufthansa crane than the Singapore Airlines crane.
I’m guessing it has something to do with Singapore Airlines, but then again, why is it parked over on the wrong side if it’s something to do with a commercial airline?