Yes, you almost always change planes on a stopover, as a stopover is essentially an "extended layover" lasting more than 24 hours. The purpose of a stopover is to allow you to leave the airport, stay in a hotel, and explore a "middle" city for a few days before continuing to your final destination (e.g., stopping in Dubai for 48 hours on the way from London to Sydney). Because the time gap is so large, the original aircraft will have long since departed with other passengers. The only exception is a "technical stop" or a "direct flight with a stop" (like Southwest’s "no plane change" routes), where the flight number stays the same and you remain on board; however, these are strictly categorized as "stops," not "stopovers." In 2026, airlines like Icelandair and Turkish Airlines have popularized "Stopover Programs" where you can purposefully book two different flights on the same ticket to enjoy a "two-for-one" vacation experience.