If planes flew in formation like wild geese they might use five to 10 percent less fuel, European aircraft maker Airbus said Wednesday as it signed up to test the idea. (techxplore.com) さらに...
That is interesting: "Jet engines meanwhile produce a vortex that contains a flow of rising air". I was taught that the vortex (wake turbulence) was a byproduct of the wing producing lift. I knew the FAA had it wrong all along ;-) Nice job of fact-checking techxplore!