Concourses can differ significantly from one another. In large airports, there may be several of them, sometimes connected by trains, tunnels, or walkways. Some concourses are compact and serve a few flights, while others are vast spaces with their own shops, lounges, and relaxation areas. However, their main function is always the same: to organize passenger waiting and boarding. Clear navigation and precise timing are especially important in the concourse. A navigation error or a delay on the way to the gate can create tension in the final minutes before a flight.