Vi har fortfarande ett slags lapptäcke i luften, med 58 nationella luftrumsblock, även om vi vet att vi egentligen bara skulle behöva ett, eller för att vara generös, kanske tre eller sex. ###>We still have a kind of patchwork in the sky, with 58 national airspace blocks, even though we know we would really only need one, or to be generous perhaps three to six.