Boeing (Chicago, Seattle and Charleston) and BOC Aviation have finalized an order for two additional 737-800s, valued at $186 million at current list prices.

The order is a part of the Singapore-based leasing company’s effort to grow its portfolio of fuel-efficient airplanes.

BOC Aviation, owned by Bank of China, is the leading global aircraft leasing company based in Asia, owning one of the youngest fleets in the industry with an average aircraft age of less than four years. These two aircraft add to BOC Aviation’s order of 82 Boeing aircraft in August, which comprised 80 737s, of which 50 are 737 MAXs, as well as two 777-300 ERs (Extended Range).