The Tianjin Dongjiang Free Trade Port Zone is the base for five headquarters from home and abroad, as well as 242 SPV （special purpose vehicle）companies in the aircraft leasing business, the zone's management committee said.

The zone started operating in 2007 and is China's largest free-trade harbor area.

Since then, aircraft leasing companies registered in the zone have contracted out 246 jets, about 90 percent of the domestic market share, with business worth $10.6 billion.