Right, plenty of excellent captions from all of you - here's a couple:
C52:
I call it AWACS: Aeroplane With A Circular Surface.
Beamr:
We all know that frisbee flies jolly well, but how do you throw this thing?
Kilty:
Well the plans fell out of Master Treadigraph 's ( age 6 ) math jotter
C52:
"We told the designer to copy a boomerang to ensure the plane returns safely from every mission, but someone described a frisbee to him when he asked what a boomerang was."
Ninthace:
No idea. It followed me home. Can I keep it?
622:
Scotty and Bones dissapointed with the first USS Enterprise
But there can only be one winner and it is:
Ninthace:
'Ow does it fly monsieur? Well ze take off run is very short but ze 'andling is a bit crêpe.
Well done Chap, I'll toss the CST in your direction with your choice of savoury or sweet filling.
(My entry might have been: Dick Van Dyke and Julie Andrews with the secret of how Mary Poppins really flew...)