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 Poitiers Biard Airport flight would often be abbreviated as a PIS flight.
Most people fly into Poitiers Biard (PIS) if they book a flight to Poitiers. Biard is conveniently located just 2.1 km from Poitiers’s city center.
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