On United Airlines, a layover is defined as a connection between flights that lasts less than 24 hours for international itineraries or significantly less for domestic trips. During a layover, you typically disembark from your first aircraft at a hub airport—such as Chicago O'Hare (ORD), Denver (DEN), or Newark (EWR)—and wait in the terminal for your next flight segment. For most domestic United itineraries, your checked baggage is automatically transferred to your final destination, but for international arrivals into the U.S., you must collect your bags, clear customs, and recheck them even if your next flight is also with United. Unlike a "stopover," which allows for a stay of more than 24 hours to explore a city, a layover is meant for transit. United's "Minimum Connection Time" (MCT) ensures that legal connections booked on a single ticket provide enough time to navigate the airport, though savvy travelers often prefer a buffer of at least 90 minutes to account for potential delays or terminal changes.