Any of the best "freeware" 707's would be over at the Historic Jetliners Group or HJG for short. They have a lot to choose from and even some rarer birds. Try there. Kind regards, Jeremy
Most people think that flying a plane is dangerous, except pilots because they know how easy it is. Arguing with a pilot is like wrestling with a pig in the mud, after a while you begin to think the pig likes it.