United Airlines CEO Scott Kirby was one of the first leaders of a major American company to insist all employees be vaccinated against COVID-19. The move was controversial. But in the end, over 99% of workers complied. Kirby tells Alan Murray and Ellen McGirt that while he was confident the mandate was the right choice, he's glad the process is now in his rearview mirror.

In this episode of Leadership Next Kirby shares how he makes hard decisions. He talks about United's commitment to be "100% green" by 2050. (He's quick to point out that carbon offsets do NOT figure into the company's plan.) And, he explains how his military training and love of reading have set him up for success.