"An American businessman familiar with the program, though not involved in the contracts, said that it "changes the optics, which is important. As much as you can put a Yemeni face on it, it feels better." He also said the program would give the U.S. some deniability in the killings. "If a Reaper" — a type of drone — "kills someone, you know if it's America that did it," he said. "If an Air Tractor, which looks like a World War II aircraft, kills someone, you might think, 'Well, that might be Yemen.'" " (thanks Amir)