DUBLIN (Reuters) - GECAS, the world's largest aircraft leasing company, is close to placing an order for around 40 Boeing <BA.N> medium-haul jets, industry sources said on Monday.
The order may include a mixture of revamped Boeing 737 MAX aircraft, designed to save fuel with the introduction of new engines from 2017, and Boeing's best-selling current model, the 737-800.
Such an order would be worth some $4 billion at list prices if split evenly between the two models.
Boeing and GECAS both declined comment.
GECAS is owned by General Electric <GE.N> which makes the engines for the 737 family in a transatlantic joint-venture co-owned by France's Safran <SAF.PA>.
In October 2012, GECAS ordered 75 Boeing 737 MAX jets and 10 current 737-800s and took options for up to 15 additional 737-800s. Boeing's 737 competes with the Airbus <AIR.PA> A320.
(Reporting by Tim Hepher, Conor Humphries; Editing by Victoria Bryan)