Did you know that...

1. Pan Am was the first airline to operate the TriStar 500 with extended wingtips/active ailerons, in 1980?
2. The first TriStar 500 models delivered to British Airways in 1979 did not originally have the wingtip extensions? They were retrofitted later.

3. The extended wingtips/ active ailerons were first installed and tested in the L-1011 prototype (N1011)?

N1011 - standard lenght TriStar - with active ailerons

You can read more about active ailerons/active control system here.