What city does the airport code PWM represent?

The airport code PWM represents Portland International Jetport, which is located in Portland, Maine. Each airport is assigned a unique three-letter code, known as an IATA code, that is used globally to identify airports. PWM is derived from the name of the city it serves—Portland. This particular airport serves as a regional hub for flights, connecting travelers to various destinations across the U.S.

The other options reference airport codes or cities that do not share the PWM designation. Chicago's airports are represented by codes like ORD for O'Hare and MDW for Midway, while West Palm Beach, Florida, has the airport code PBI. Knoxville, Tennessee, is represented by the code TYS. Thus, the association of PWM specifically with Portland, ME, is the accurate identification in this context.