I remember that at one time in history Boeing offered a retrofit of Boeing 747-400 style winglets to Boeing 747-300 owners. The number of 300 series metal produced is rather small and the number of operators was also limited (CX, QF, SN, SQ, SR come to mind).
I can't recall that any operator did actually order the modification onto any Boeing 747-300. Does anybody know of a Boeing 747-300 that was applied the upgrade?
I would have loved to see SN's last and very new (OO-SGD; a Boeing 747-300 delivered while others were already taking the 400, fools) - or even its predecessor (OO-SGC) - fly with winglets. Especially that it already had the redesigned wing to body connection of the later serie if I'm not mistaken.
Any details welcome!