POS stands for Port of Spain Piarco Intl Airport. Codes like this one are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.
Port of Spain Piarco Intl (POS), located 20.3 km from the city centre, is the airport you fly into when you book flights to Port of Spain.
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