In aviation and travel terminology, the difference between a stop and a layover (and a "stopover") is defined by the duration of the time spent on the ground and whether you change aircraft. A layover is a short connection, typically lasting anywhere from 30 minutes to 24 hours for international flights (or under 4 hours for domestic U.S. flights). During a layover, your primary goal is simply to change planes and continue to your final destination; your bags are usually checked through automatically. A stopover is a much longer break in the journey, usually lasting more than 24 hours, where you intentionally stay in a city for a day or more before moving on. Many airlines, like Icelandair or Emirates, offer free stopover programs to encourage tourism. A technical stop (or just a "stop") is when the aircraft lands to refuel or pick up passengers, but you often stay on the same plane and keep the same flight number. For example, a flight might be listed as "1 stop," which could mean you sit on the tarmac for 45 minutes without ever leaving your seat. Understanding these terms is crucial for booking, as "stopovers" often trigger different fare rules and may require you to collect and re-check your luggage.