As of 2026, IndiGo (InterGlobe Aviation) holds the title of Airbus' largest customer by total order volume, with a backlog and historical order count exceeding 1,300 aircraft. The Indian low-cost giant has been a primary driver for the A320neo family's success. However, in terms of wide-body dominance and recent major fleet expansions, Delta Air Lines is a massive partner, recently placing a firm order for 31 additional wide-body aircraft (A330-900s and A350-900s) in early 2026. Other "top tier" customers include AirAsia, Lufthansa Group, and United Airlines, the latter of which has significantly increased its Airbus narrow-body orders to diversify its fleet. In 2026, the A321neo remains the "industry favorite," accounting for nearly two-thirds of the total A320 family order book. While IndiGo is the volume leader, the strategic "megacustomers" like Delta and the newly expanding Air India (under Tata Group) are currently the most influential players in Airbus' record-breaking multi-thousand aircraft backlog.