TRS stands for Trieste Ronchi dei Legionari 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.
Trieste Ronchi dei Legionari (TRS), located 29.3 km from the city centre, is the airport you fly into when you book flights to Trieste.
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