More than 97 percent of United Airlines’ U.S. employees are vaccinated against Covid-19 as the carrier’s deadline for its vaccine mandate nears, the airline reported in a memo to employees this morning.

Per the mandate announced in August, United’s U.S. employees have until Sept. 27 to upload records that they have at least received their first dose of one of the approved vaccines. United said it would start the “separation process” with employees who had not received and reported their vaccination nor had been granted an extension as soon as the following day. Employees have until Oct. 31 to be fully vaccinated.

United’s mandate came before U.S. President Joe Biden announced executive orders that included asking the U.S. Department of Labor to develop a requirement for vaccines or weekly testing at any business with more than 100 employees. The 97 percent vaccination rate does not include the “small number” of employees who are seeking an exemption, according to United.