Some 41.3 million people traveled through airports in Turkey between this January and March, the country's airport authority announced on Friday.
First quarter figures were down 4.2% percent from the same period last year, according to the General Directorate of the State Airports Authority.
The number of international passengers rose 7.5% on a yearly basis in the first three months of 2019 to reach 16.7 million.
The number of passengers taking domestic flights totaled 24.6 million, falling 10.8% during the same period.
The report also said cargo traffic saw a rise of 4.4% year-on-year to 815,921 tons from January to March.
Turkey served 424,656 planes in the first quarter, broadly unchanged from the same period last year, including overflights.
Istanbul's Atatürk Airport remains the busiest in Turkey, serving 107,072 planes -- likely to be soon eclipsed by the new mega-Istanbul Airport, where operations are currently moving.
Atatürk Airport was followed by Sabiha Gökçen Airport -- Istanbul's main air hub on the city's Asian side -- with 54,557 planes, and the capital Ankara's Esenboğa Airport with 25,804 planes.
Istanbul Airport, whose first phase officially opened on Oct. 29, served 2,630 planes and welcomed 318,182 passengers during the same period.
At a full annual capacity of 200 million passengers -- with the completion of all four phases with six runways by 2028 -- Istanbul Airport is set to become a global aviation hub hosting more than 100 airlines and flights to over 300 destinations around the world.
