Turkish MAN-LAX
Some bloke from Venezuala suggests this route from thin air on another internet website and we're off into the silly season!
As to BAs MAN-LAX, full though it often was in the peak season, overall it lost lots of money. Just because you see bums on seats does not equate to a profitable route. If THY decide to stop the progress of their LAX passengers by stopping in Manchester for a wee break then that's simply fabulous. Unless you started in Turkey when it simply becomes another pain in the ( numbed )arse of an already long flight.
Multi stop, multi country long haul drops like this hardly ever work. Look at Saudia for God's sake. It would be way simpler just to connect at Heathrow!
Even Singapore are turning the clock back to the 80s and stopping en-route. A non starter, or a one season wonder. Before anyone mentions PIA there are almost as many Pakistanis in the North West than there are anywhere else in the world so PIA is a local service airline. Turkish isn't.