Scott Kirby, the chief executive of United Airlines, reached a breaking point while vacationing in Croatia this summer: After receiving word that a 57-year-old United pilot had died after contracting the coronavirus, he felt it was time to require all employees to get vaccinated.He paced for about half an hour and then called two of his top executives. “We concluded enough is enough,” Mr. Kirby said in an interview on Thursday. “People are dying, and we can do something to stop that with United Airlines.”The company announced its vaccine mandate days later, kicking off a two-month process that …
