Flights up to 500 miles were boosted $20 both way, individuals from 501 to 1,500 miles were raised $40 both way, and flights longer than 1,500 miles increased by $60 both way, he supposed.Were responding to the Delta initiative, Martelle alleged while asked why American, a component of AMR Corp., was raising prices.Delta Air defenses Inc. established the fare hike but declined to allocate a end. United, Continental and US Airways fixed with the purpose of they too raised prices.