In 2026, Delta eCredits are primarily restricted to the purchase of air travel and associated government-imposed taxes and fees. Specifically, you can use them to book any flight operated by Delta Air Lines, Delta Connection, or Delta’s partner airlines (like Virgin Atlantic or Air France-KLM) as long as the booking is made through Delta’s official website or app. Unfortunately, you generally cannot use eCredits for "ancillary" services such as purchasing SkyMiles, paying for checked baggage fees, buying seat upgrades after the initial booking, or purchasing onboard food and beverages. They also cannot be used for Delta Vacations packages unless the credit was specifically issued by that department. However, a helpful "hack" in 2026 is that if your eCredit is for a large amount, you can use it to book a higher class of service (like Comfort+ or First Class) at the time of initial purchase, which effectively lets you use the credit for an "upgrade." Always check the expiration date, as most eCredits must be "booked and flown" within a specific timeframe, usually one year from the original ticket issuance.