What is the airport code for Chicago's O'Hare International Airport?

The airport code for Chicago's O'Hare International Airport is ORD. This code is derived from the airport’s original name, Orchard Field, which is where the "ORD" abbreviation comes from. The codes used for airports are designated by the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA), with IATA codes often being more recognizable to travelers.

The other options refer to different airports: MSY is the code for Louis Armstrong New Orleans International Airport, PBI stands for Palm Beach International Airport, and PDX is the code for Portland International Airport. Each of these codes corresponds to specific locations and is used for ticketing, checking luggage, and navigating airport systems. Knowing such airport codes is valuable for travelers, as it helps in identifying their departure and arrival points quickly.