on 28 april 2016, bombardier and delta air lines announced a sale for 75 cs100 firm orders and 50 options; the first aircraft should enter service in spring 2018. delta air lines, it was thought, would likely start using more fuel-efficient cs100s in 2018 on flights out of los angeles, new york and dallas. airways news believe that a substantial 65 to 70% discount off the $71.8 million list price was provided making the final sale at $24.6–28.7 million price per aircraft; this large order from a major carrier could help bombardier to break the boeing/airbus duopoly on narrowbody aircraft.