SEATTLE — Alaska Air Group told employees Thursday evening they will be required to get a COVID-19 vaccination, with some exceptions — a shift from the policy laid out last month that only encouraged and rewarded vaccinated employees.

In an email to all Alaska Airlines and Horizon Air employees, the Seattle-based company said that in accordance with the White House executive order that requires all federal contractors to have their workers vaccinated, "All employees will now be required to be fully vaccinated or be approved for a reasonable accommodation."

That replaces the policy Alaska announced last month, which paid vaccinated employees $200 and required regular testing for others. At that time, Alaska said that 75% of its employees had already been vaccinated.

A memo from Andy Schneider, Alaska's senior vice president of people, said President Biden's executive order applies to Alaska Air's subsidiaries as well as some contractors.

"After careful review of this order, we have determined that Alaska, Horizon and McGee employees (including certain contractors and vendors) do fall under this federal vaccine mandate due to our significant work for the federal government, alongside the other major U.S. airlines. This policy will replace our company policy of vaccination or testing that we announced earlier this month," Schneider told employees in the email.

Alaska said the deadline by which employees must be fully vaccinated could be as early as Dec. 8, and it laid out timelines for getting each of the available vaccines in order to meet that deadline. It said the company is extending its offer of $200 to newly vaccinated employees until Dec. 1.

Alaska said employees can request "reasonable accommodation for sincerely held religious beliefs or a medical condition that prevents them from getting the vaccine Dec. 1."

Those employees who are granted an exemption for religious or medical reasons "may be subject to additional protocols such as weekly testing, continued masking and social distancing, modified work schedules or locations, delayed training class start dates, the inability to attend in-person events or unpaid leaves of absences," Schneider's email said.

United Airlines, which in August announced it would require employees to get vaccinated, said Tuesday that while nearly all of its 67,000 employees had been vaccinated, 593 employees faced termination because they had not been vaccinated or received an exemption. On Thursday, the company said the number facing termination had dropped to 320.

As of December, Alaska Air employed nearly 22,000, according to regulatory filings.

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