If you received any kind of travel voucher from an airline, that voucher might expire soon.
If you had to change or cancel travel plans because of the pandemic you were most likely issued a voucher or credit from the airline on which you booked a flight. In many cases vouchers last just one year. So, if you booked a flight for spring of 2020 that was cancelled, the credit that was issued will expire soon.
Delta just extended their expiration date until the end of 2022.
Jack & Carolyn talked about this on the Morning Breeze. Listen here: