This is just an IATA (International Air Transport Association) code. IATA codes are used in aviation to identify and differentiate airports. That’s why a Portsmouth Pease Intl Airport flight would often be abbreviated as a PSM flight.
Most people fly into Portsmouth Pease Intl (PSM) if they book a flight to Portsmouth. Pease Intl is conveniently located just 5.1 km from Portsmouth’s city centre.
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