Delta certificates are gift vouchers you can purchase for any occasion. However, they are not redeemable on the company's website, whereas eCredits, which are electronic vouchers issued by the company to be applied toward the cost of your ticket for another flight, can be used online. Delta provides three three ways to acquire these two documents.
Purchase up to three Delta certificates one at a time, in dollar amounts not exceeding $350, at any Delta ticket office or any Delta airport location. Use cash, check, or a credit card,
Visit a Delta ticket office or airport location and book an unused non-refundable ticket toward a less expensive flight. The money you have left over will be converted into an eCredit voucher, valid for one year from the date of issue, and that you can either use online for yourself or for a designated individual of your choice.
Book an unused non-refundable ticket toward a less expensive flight over the phone with Delta's customer service team. Whatever money left will be converted into an eCredit voucher, which will be valid for one year from the date of issue. It is possible for you to use it online for yourself, for a friend, or a family member.