Well, Delta tickets do not normally expire one year from the date of their purchase however, if it was expiring in 2022, then all tickets which will be purchased in 2022 will be able to be rebooted until 2023 for travel through 2024. Passengers can also use their credits to verify their existing value or the expiration date of their existing air flight tickets. For more eligibility and terms to know, the passengers can check out the official site of delta Airlines or call their extensive customer service for assistance.