MIAMI — Brazilian aircraft manufacturer, Embraer, and U.S. regional carrier, SkyWest, have announced a $914 million order for 20 E-Jets, of which 15 will fly for Delta Air Lines, and the other five for Alaska Airlines.

Last month, the carrier had announced an order for 25 additional aircraft, adding up to a large order of 45 E-Jets.

According to Embraer, these jets will begin their manufacturing process immediately and deliveries are set to begin in the last quarter of 2017 through the end of next year.

Currently, SkyWest has a mixed fleet of Embraer and Bombardier aircraft, adding up to 422 jets. The Bombardier fleet is composed of 318 CRJ-100/200/700/900s and 104 Embraer E-175s.

SkyWest has reportedly ordered 15 Embraer 175SC (Special Configuration), which come equipped with 70 seats. However, the remaining five planes will be fitted with a higher density configuration of 76 seats.

The U.S. regional carrier has become one of the largest Embraer customers, with over 380 aircraft since January 2013.