 At his retirement he had nearly 8,000 total flying hours, 4,900 in single-engine jets, and had flown the F-80 Shooting Star, F-84 Thunderjet, F-100 Super Sabre, F-101 Voodoo, F-104 Starfighter, F-105 Thunderchief, F-106 Delta Dart, FB-111, F-4 Phantom II, A-4 Skyhawk, A-7 Corsair II, CF-5 Tiger, F-16, and F-15 Eagle jet fighters.Following his retirement, Day wrote an autobiographical account of his experiences as a prisoner of war, "Return with Honor", followed by "Duty, Honor, Country", which updated his autobiography to include his post-Air Force years.Among other endeavors, in 1996 Day filed a class action lawsuit for breach of contract against the United States government on behalf of military retirees who were stripped of their military medical care benefits at age 65 and told to apply for Medicare.