If there’s an airport nearby, aeroplanes are my favourite moving objects. If you want a tip, keep the plane in the viewfinder with some ground and buildings in the background and follow it through the air by moving your hips and torso around. You can give the impression of speed by varying the shutter speed, which will blur the background but not the plane.
Good Luck!
PS just read your post again and see i'm barking up the wrong tree! Sorry!