並前往https://aviacenter.ru/files/help-desk/NEWS%202020/%D0%B0%D0%B2%D0%B3%D1%83%D1%81%D1%82/26/Handling%20Guideline%20for%20Ticket%20Change%20Refunds%20of%20BR%20B7%20flights%20due%20to%20COVID-19%20(%20agent%20)%20revised..pdf