A320 engine winglets.
A couple of weeks ago in Edinburgh I saw a BA A320 or A319, (not sure which), with two winglets on either side of each engine.
They appeared to be fixed (as opposed to retractable), something I've never seen on any Airbus before and none of the other similar types I saw on the day appeared to have them.
I assume they're part of some aerodynamic scheme, can anyone shed any light on the subject?
Ta.