Originally Posted by
futurama
Interesting that Alaska Airlines, American Airlines and United have reported zero cracking so far (as of the 7-day deadline for highest cycle planes). Together they have some of the world's largest (& oldest NG) fleets.
Gol on the other hand has 11. I believe they have "aftermarket" winglets so maybe that is indeed a difference.
It would be interesting to compare crack incidence with type of winglet and how many cycles since they've been installed. Some of these aircraft may have accumulated a lot of their cycles prior to having winglets installed.