Flying below radar half way round the world, the fuel requirements are going to be hideous and the wingspan massive. However if you allow for most of the journ

Flying below radar half way round the world, the fuel requirements are going to be hideous and the wingspan massive. However if you allow for most of the journey to be done by sea and assuming your destination is relatively close to the coast and you do not care if it takes ages, then you could transport a small aircraft in one of those passive sea drones that navigate using variable buoyancy by gliding underwater to a set depth, before going back to the surface again for a recharge and gps check.