Read the top link, it gives the whole story, he had recently retired from Delta at 65 and joined the company.
Justinic had close to 50 years of experience flying, first for law enforcement and then for Delta Airlines. According to FAA rules, pilots who reach age 65 can no longer fly large commercial airline jets, but they can continue to fly for private companies if their medical requirements are kept up-to-date. In January 2017, after retiring from Delta, he took a position flying a private plane for Columbia Sussex.