Plan on traveling by plane within the U.S. soon? Then you’ll need to plan on paying more per ticket on at least four major airlines, who implemented a ticket price increase Tuesday. Delta Air Lines raised ticket prices by $4, $6, and $10 “across the bulk of their domestic route system,” reports Farecompare.com . more › See original here: What’s Up? Airfare On Four Major U.S. Airlines, Ouch!