HAIKOU, Jan. 16 (Xinhua) -- A Boeing B787-9 aircraft of Mongolian Airlines arrived at the one-stop aircraft maintenance base of Hainan Free Trade Port to receive examination and maintenance services on Thursday. This marked the first order for maintenance of inbound aircraft at Hainan Free Trade Port for the year 2025 and also the first of such services for aircraft from Mongolia. The services kicked off on Thursday, eligible to preferential treatments of the free trade port including exemption of cash deposite as well as duty-free fuel and maintenance supplies.