An airline code (or airline designator) is a two-character alphanumeric identifier assigned by the International Air Transport Association (IATA) to uniquely identify an airline. For instance, "AA" represents American Airlines and "LH" represents Lufthansa. A flight number is a specific numerical code assigned to a particular flight route and time, such as "123." Together, they form a flight designator (e.g., AA123). This system is essential for organizing global air traffic, managing passenger bookings, and coordinating airport logistics. By convention, eastbound and northbound flights often use even numbers, while westbound and southbound flights use odd numbers. Flagship or high-priority routes are frequently assigned prestigious low numbers, such as "Flight 1." Understanding these codes is vital for travelers to track their arrivals and departures accurately through airport monitors or mobile apps, ensuring a smooth transit through the complex global aviation network.