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 Harlingen Valley Intl Airport flight would often be abbreviated as a HRL flight.
Most people fly into Harlingen Valley Intl (HRL) if they book a flight to Harlingen. Valley Intl is conveniently located just 5.9 km from Harlingen’s city centre.
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