we've been over this before but for review, companies have loyalty programs to help keep customers, wait, wait, loyal and paying the revenue that airlines need.This is not the first revision of DL's Skymiles program. If DL was doing it all wrong, then DL's customers would vote with their wallets and DL would figure it out.That isn't happening or DL couldn't have the highest RASM growth at least among the legacy carriers and perhaps all of the industry over the past several years PLUS the highest absolute RASM.DL customers are staying with DL and spending even more money to fly with DL.DL simply doesn't have to give away as much of its product as it used to or what other carriers do.it's also worth noting what airlines are in the first group and who is much further down the list.DL's strongest JV partners including Skyteam heavyweights AF/KL are in group 1 but so is Gol and, believe it or not, AS.KE, a founding member of Skyteam, is lumped in with Hawaiian and Great Lakes. that should tell you a whole lot about how DL intends to incentivize passengers who fly on those carriers and thus its overall gains from those carriers.