|Quoting TomFoolery (Reply 2):|
It had been determined that due to the degree of work necessary, sharklets would only be installed during production, rather than as an aftermarket retrofit.
Tom, is this recent news...?
"Airbus is finally granting JetBlue's wishes for a winglet retrofit programme, and is working with the airline to become a launch customer to retrofit its existing A320 fleet"
The short history; JBU worked w/ Airbus for many hrs developing a winglet mod for the A320 over the last 5yrs.
Airbus shelved the idea, originally. My speculation, "A" probably delayed any proposed sharklet retrofit once they decided to offer factory new sharklet A320s and A320NEOs, perhaps fearing an impact of sales to these newer offerings. Seems like a big "A" customers (JBU), finally pushed Airbus over the edge, into offering such a retrofit.
No doubt, a sharklet retrofit on a earlier A320 model might be a supreme PITA, wrt wing structure reinforcements, but I would speculate JBU wouldn't have pushed Airbus into it, unless they believe it would provide some benefit, even considering all the PITA and additional wt it may cause.