United Airlines has said it will mandate COVID-19 vaccinations for all new external hires, the company said in an internal memo shared with Insider. All new employees receiving job offers after June 15 will be asked to show proof that they are fully vaccinated, United said in the memo.

“As we welcome new employees to the company, it’s important we instill in them United’s strong commitment to safety,” the memo said. “They will be required to upload their COVID vaccine card in My Info no later than 7 days post hire date.”

The airline said the new rule applies only to US-based hires, with an exemption for internationally-based staff.

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