In airline operations, what does a passenger classified as 'No Show' typically indicate?

A passenger classified as 'No Show' typically indicates that the passenger has not arrived for their confirmed flight. This classification is important for airlines as it helps manage seat inventory and make informed decisions about overbooking and flight capacity. When a passenger fails to show up for their flight without prior notification, it can affect the airline's operational efficiency and revenue management.

The 'No Show' status is particularly significant in the airline industry, as it often requires the airline to adjust its expectations for that flight's occupancy, affecting both gate agents and subsequent scheduling. Understanding this classification allows airlines to implement policies that may include offering standby options to other travelers or releasing seats for sale.

In contrast, the other options describe situations that do not align with the definition of a 'No Show.' Upgrading a seat implies attendance on the flight, checking in but not boarding still suggests an intention to fly, and arriving at the wrong terminal indicates a logistical issue unrelated to flight attendance.