Uplinker #31
You may find some of the discussion with Takata on 17 July 2011 on pprune.org af447 Thread no5 pages 392-397
may be of help...
I would guess at 40,000 hours/ aircraft's life when the wing-tips should provide a benefit. For the rest... just be grateful !
I think that they are both aeroplanes.
( Sorry, cannot redirect you, my computer/I ... too old !)
LT