MiG-29 jet fighters of the Strizhi (Swifts) and Sukhoi Su-27 jet fighters of the Russkiye Vityazi (Russian Knights) aerobatic teams perform during a demonstration flight at the MAKS International Aviation and Space Salon in Zhukovsky outside Moscow August 27, 2013. The world's top aircraft makers, scenting a major opportunity in replacing ageing Russian air fleets, will be touting their wares at Moscow's MAKS air show this week in the hope of winning a big slice of that multi-billion dollar market. [Photo/Agencies]