PSM is a unique code, commonly called an IATA code, used in the aviation industry to identify airports. This code, along with many others, are defined by IATA (International Air Transport Association). A PSM flight refers to a flight to Portsmouth Pease Intl Airport.
If you book a flight to Portsmouth, you will be flying into Pease Intl, which is the city’s only airport. Portsmouth Pease Intl (PSM) is located 5.1 km from the centre of Portsmouth.
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