the.com/flight numbers
a code that lets one route wear two different disguises depending on who sold you the seat.
means the airline-and-digits combo (like AA100) that identifies a specific scheduled flight, though it can hop planes, gates, and even codeshare partners without warning.
from grew out of early 20th-century airline timetables, where routes needed short labels for telegraphs and ticketing; the two-letter airline code system got standardized by IATA in the 1940s so agents worldwide could book the same flight without confusion.
even vs oddeastbound flights traditionally get even numbers, westbound odd
retired numbersairlines pull numbers after fatal crashes, like unlucky jersey numbers
codeshare trickone physical plane can carry five different flight numbers
low numberssingle and double digits often signal an airline's flagship route