All scheduled commercial passenger flights were transferred from Istanbul Atatürk Airport to Istanbul Airport on April 6, 2019, following the closure of Istanbul Atatürk Airport for scheduled passenger flights. The IATA airport code IST was also transferred to the new airport. Once all phases are completed in 2025, the airport will be able to accommodate 200 million passengers a year.
Getting out of the airport to the city is available by bus and taxis. No trains yet by 2020
It is a large and far airport. Better schedule your day accordingly. It takes quite some time to drive to the airport and you will have to walk inside the airport a lot although there are many moving walkways.