Albury helped fly the B-29 Superfortress, nicknamed "Bockscar," that dropped the weapon on Aug. 9, 1945. He also witnessed the first atomic blast over Hiroshima, as a pilot on a support plane that measured the magnitude of the blast and levels of radioactivity.
The Hiroshima mission was led by Col. Paul Tibbets Jr. aboard the better-known "Enola Gay."
"When Tibbets dropped the bomb, we dropped our instruments and made our left turn," Albury told Time magazine four years ago. "Then this bright light hit us and the top of that mushroom cloud was the most terrifying, but also the most beautiful, thing you've ever seen in your life. Every color in the rainbow seemed to be coming out of it."
Three days later, Albury copiloted the mission over Nagasaki. Cloud cover caused problems for the mission until the bombardier found a hole in the clouds.
The 10,200-pound explosive instantly killed an estimated 40,000 people. Another 35,000 died from injuries and radiation sickness. Japan surrendered on Aug. 14.
Albury said he felt no remorse, since the attacks prevented what was certain to be a devastating loss of life in a U.S. invasion of Japan.
"My husband was a hero," Roberta Albury, his wife of 65 years, told The Miami Herald. "He saved one million people ... He sure did do a lot of praying."
Gwyneth Clarke-Bell, Albury's secretary at Eastern Airlines, where he worked for most of his career after World War II, told the Herald that Albury "felt he was doing his job, and that lives were saved on both sides."