• But, again, most likely due to more stringent maintenance, training, and procedural regulations thank because of any technology improvement. American’s average plane age is 11y/o; United is 14 y/o; Delta’s average plane age is 17 years old. Despite bring nearly half again older, Delta’s safety record isn’t much worse than American’s. There’s little or no correlation between fleet age and safety, and it’s more rational that any increased accident rate of older planes is due to wear and tear and general ages of the planes rather than the technology in them.