No, you generally cannot earn frequent flyer miles on a ticket that was purchased entirely with miles (an "Award Ticket"). Frequent flyer programs are designed to reward "paid" or "revenue" travel. When you redeem miles for a flight, the fare class is usually categorized as "X" or "U," which are non-earning classes. However, in 2026, there is a common exception: "Miles + Cash" bookings. If you pay for a portion of your ticket with cash and the rest with miles, many airlines (like Delta or United) will allow you to earn miles based on the cash portion of the fare. Additionally, even on award tickets, you can still earn "status miles" or "Premier Qualifying Points" (PQP) on certain airlines if you have their co-branded credit card or if you are flying during a specific promotion. It is also important to remember that while you don't earn miles on the flight itself, you still earn miles on any incidentals or upgrades you pay for with a credit card during your trip, such as checked bags or in-flight meals.