United Airlines will require its 67,000 U.S. employees to get vaccinated against Covid by no later than Oct. 25 or risk termination, a first for major U.S. carriers that will likely ramp up pressure on rivals. Airlines including United have so far resisted vaccine mandates for all workers, instead offering incentives like extra pay or time off to get inoculated. U.S. companies such as Facebook announced employees have to prove that they have been vaccinated to return to the office. "We know some of you will disagree with this decision to require the vaccine for all United employees," United CEO Scott Kirby and President Brett Hart said Friday in an employee note. In comparison, about 60% of American Airlines' pilots are vaccinated, according to an Aug. 5 letter to members from their union, the Allied Pilots Association, which encouraged aviators to get vaccinated.