LTBA meaning in Regional ?

Answer: What is Istanbul Atatürk International Airport mean?

Atatürk Airport (IATA: ISL, ICAO: LTBA) (former IATA code: IST) (Turkish: Atatürk Havalimanı) is a general aviation and cargo airport in Istanbul. It used to be an intercontinental passenger hub and closed to commercial passenger flights on 6 April 2019 when all flights were transferred to the new Istanbul Airport. Since then, the airport has been open only for cargo, maintenance, general aviation, air taxis, business flights, and state and diplomatic aircraft, while commercial passenger flights are all handled at the newly built Istanbul Airport.

reference

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Istanbul Atat?k International Airport	Regional