The Delta Air Lines Airbus A350-900 has increasingly become the carrier’s long-haul flagship in 2026, and it is also one of the trickiest aircraft to find a perfect seat on. This is because Delta Air Lines flies multiple different Airbus A350 layouts under the same branding. Depending on whether you are flying the standard configuration, the ultra-premium configuration, or the ex-LATAM setup, there will be some important differences to keep in mind. Cabin sizes will shift, row numbering will change, and the best seats can easily move from one flight to the next, even within the same class of service.