Can we have our “friendly skies” back? It isn’t so simple as not beating passengers. The U.S. aviation industry has long spiraled from literal to what some consider moral bankruptcy. In the ’90s, deregulation offered customers generous choices and fares, yet 9/11 and economic implosions saw U.S. carriers bleed out. Some absorbed failed competitors, and with passengers fixated on low fares, an oligopoly was born. Today, four airlines own 80 percent of the American market — so no matter how angry, travelers will probably continue to grit their teeth and fly United.