An analysis on November 27, 2025, reveals the current state of Delta Air Lines' premium business class product, the Delta One Suite. Eight years after its initial launch, the suite, which features a closing door, is still not consistently available across the airline's long-haul fleet. The most spacious versions are found on the Airbus A350-900, with a slightly more compact version on the A330-900neo aircraft. However, several key aircraft in Delta's international fleet, including the Airbus A330-200, A330-300, and the Boeing 767 family, do not yet feature the updated suites. Passengers on these planes experience older reverse-herringbone or staggered seating arrangements. While the Boeing 767-400ER fleet has received refreshed seats with privacy dividers, the experience is noted as being less spacious. A retrofit for the Airbus A330-300 aircraft is anticipated to begin in late 2026, though Delta has not officially confirmed that these planes will receive the full Delta One Suite product. No upgrade plans have been announced for the A330-200s or the older Boeing 767-300ERs, which offer the most outdated business class experience.