United announced its vaccine mandate for all U.S.-based employees at the beginning of August. It was the first major company to announce such a mandate, though many have since followed suit.
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RELATED: United Airlines to require COVID vaccinations for all US-based employees
In a memo to staff, United executives said more than 99% of the airline's U.S. employees have been vaccinated, excluding those who submitted for a religious or medical accommodation.
They acknowledged that some people had been reluctant to follow the mandate, and thanked everyone who got their shots for taking steps to protect themselves and their fellow employees. Then they announced that those who did not comply with the mandate would "begin the process of separation from our airline per our policy."
"The pandemic is now killing more than 2,000 people per day, a 65% increase in just the past 30 days, and the most effective way to keep our people safe, is to make sure they're vaccinated," the memo said.
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RELATED: Employees sue United Airlines over COVID vaccine mandate
The Chicago-based airline is facing two lawsuits over the mandate, including one in Fort Worth, Texas from an employee who alleged their religious exemption was not accommodated.
Before the mandate went into effect, six employees also asked a federal judge to block the vaccination requirement, accusing the airline of a "pattern of discrimination against employees who requested religious or medical accommodations." Those employees include two pilots and a flight attendant.