United Airlines employees who have not been vaccinated against COVID-19 for religious or medical reasons will be allowed to return to work later this month.

In August, United was one of the first companies to require proof of vaccination for its U.S.-based employees. Of 67,000 employees, 2,200 applied for religious or medical exemption and were generally placed on unpaid leave or given a role that did not require customer interaction, according to the Wall Street Journal.