Flying to Hawaii a couple of weeks ago, I was remined of the phrase, “You may be talking but nobody is listening.” Hawaiian Airlines had seen fit to pollute the cabin with an endless stream of untargeted advertising on the plane’s set of televisions (no fancy seatback units here).Now, at least on American Airlines the “advertising” mostly masquerades as entertainment (CBS sitcoms or clips of Letterman and 60 minutes) to try and loyalize the shows’ base or to pull in new viewers, but it’s still advertising. American Airlines has traditional advertising as well, but less than what I saw on Hawaiian Airlines.Broadcast networks have at least some justification for spamming people over the airwaves (it’s their only revenue source and they are only able to target based on dominant audience profiles). The availability of on-demand, seatback entertainment systems, leaves airlines with no excuse, and in fact every motivation as …