Why does Airbus a 380 not have winglets?

Answer 1

Winglets have typically been added to existing wing designs to increase the total lift and reduce the vertices created by the wing tip.

Airports expressed a desire for wingspans not to exceed 80m as this would cause major problems with gate and taxiway designs. The Airbus A380 has a wingspan of 79.65m, so adding winglets would not have been an option and the wing was also designed from scratch to reduce the aerodynamic need. To reduce the wing tip vortices, the A380 wing has 'wing tip fences', small vertical wings that extend above and below the wing tip.