Aircraft Manufacturers Having These Weird Preferences

A large tri jet was clearly a pretty economical option over something like, you know, a four engine Boeing 707. Airlines had their choice of engines. You could get them from Pratt and Whitney or you could get it from GE supposed to the L 10 11, which only use Rolls Royce engines. There's a reason British Airways has always gone Rolls Royce stuff like that. And there's a reason for horse trading on the site as well.