Photo © Andreas Mowinckel
It's sporting blended winglets as a part of a program to determine it may be economical to retrofit these older Boeing models (733/734). It is actually not the first 733 with winglets. This was also tested out a couple of years ago.
Photo © JOE G. WALKER
As airlines mostly find it too expensive to retrofit 'old' 737NG's with winglets, one must wonder if this really is a feasable project. Nothing seemed to happen with the same project on 747's either.