I had read an article over two years ago about the test Cathay Pacific made on one of its A340-300Es with some dolphin skin on its wings, which were due to reduce drag. Thiswould result in 1 ton fuel economy on a "typical long-haul flight" (I know this is close to no meaning without the exact sector on a period pf the years in certain conditoins).
Anyone would have some information about this please?
Were the test successful?
What precise aircraft get these skins?
When was it made please?