Tags ADPi Consultant proposes lower-cost plan for HCM City airport expansion Monday, May 14, 2018 A state-owned consultancy has proposed adjustments to the expansion plan for HCM City’s Tan Son Nhat international airport. Long road ahead for Long Thanh Airport funding Monday, Oct 27, 2014 French company ADPi, a fully-owned subsidiary of the Aeroports de Paris Group (ADP), has said it did not promise to invest US$2 billion in building a new international airport in Dong Nai Province as claimed by a local official last week.