Since it unveiled its all-suite business-class concept back in August 2016, Delta has been hard at work revamping the premium cabins across its fleet. The first Delta One Suites with closing doors ...

Delta has 39 of its 767-300ERs still in service with another 49 retired. They are, on average, over 28 years old. The Boeing 767-400ER is a little younger, at an average age of 24.3 years old.

like the Boeing 767-400, seems to have been a challenge for the airline. So the business class cabins on those planes have been refurbished with Delta One seats, but without the doors, opting ...