 Spanish consulting company Ardanuy Ingenieria won a contract in October 2009 to provide a feasibility study of Line 4 of the six-line project.This line would stretch 16 km from Lang Cha Ca crossroad in Tân Bình District (near Tan Son Nhat Airport) to Van Thanh Park in Bình Thạnh District.On April 4, 2009, Spain's IDOM, Ingeniería, Arquitectura y Consultoría S.A. signed a contract with HCMC Urban Railway to provide a feasibility study for lines 5 (from Thủ Thiêm, District 2 to Can Giuoc, District 8 – 20 km) and 6 (Ba Queo, Tân Bình to Phu Lam, District 6 – 6 km).