India's planned acquisition of an additional Boeing C-17 strategic transport would boost its air force's fleet of the type to 11 examples, and the proposed purchase would be worth around $366 million.

Outlining the proposed deal late last month, following the receipt of State Department approval, the US Defense Security Cooperation Agency said the addition will enhance New Delhi's ability to "meet current and future strategic airlift requirements", and also support humanitarian assistance and disaster relief efforts.

Flight Fleets Analyzer shows the Indian air force's current 10 C-17s as between 2.8 and 4.5 years old. The service operates the largest number of the Pratt & Whitney F117-100-engined transports after lead user the US Air Force.

Boeing's last C-17 departed from Long Beach, California in November 2015, with the company having ended production by building several "white tail" examples without confirmed customers.