Under its current agreement, Delta Air Lines has disclosed an order for 12 additional A-220/300 aircraft, bringing the airline’s total firm order for A-220s to 131 units - 45 A-220/100s and 86 A-220/300. Throughout the years, Delta has reordered the A220 five times and is today the largest A-220 customer and operator in the world.
 
"In addition to its positive cabin experience, the aircraft plays an important role in helping decrease airline operating costs and environmental impact. Offering 25% lower fuel burn and CO₂ emissions per seat compared to previous generation aircraft, the A220 is the only aircraft purpose-built for the 100-150 seat market. Combining state-of-the-art aerodynamics, advanced materials and Pratt & Whitney’s latest-generation GTF™ engines, the A-220 brings customers a 50% reduced noise footprint and around 50% lower NOx emissions than industry standards", according to a note issued by the industry.
 
Delta took delivery of its first A-220 in October 2018, and was the first US carrier to operate the aircraft type. Delta currently operates a fleet of 433 Airbus aircraft, including 61 A-220 aircraft, 280 A-320 Family aircraft, 64 A-330s and 28 A-350/900 airplanes. 
 
With 271 A-220s delivered at the end of June 2023 to 16 airlines operating on four continents, the model is the aircraft to offer operational flexibility for both regional as well as long-distance routes. To date, more than 90 million passengers have flown on the A-220. The fleet is currently flying on over 1,100 routes and over 375 destinations worldwide. As of the end of June 2023, around 30 customers have ordered more than 800 aircraft - confirming its reference position in the small single-aisle market.