Analysts say the large growth in orders for Boeing and Airbus is likely to slow with lower oil prices. Access to cheap financing and high oil prices at $100-$120 a barrel led to a surge in orders. With oil below $50 in Jan. 2015 this is likely to change. A study by Ascend, an aviation consultancy, shows about 50% of the orders in the last 5 years were for replacement aircraft compared to the longer term trend of 43%. Airlines are likely to hold on to older aircraft for longer with lower oil prices. Boeing's head of market analysis, says the airlines will still benefit from fuel efficient aircraft such as the Boeing 737 max and the Airbus neo with 20% less fuel cost, even at current fuel prices. Airlines will still need to plan for growth. And Airbus executives say the fuel price levels could go up in the future as inventories fall. In the Asian market overcapacity is a problem with falling airline prices and reduced profitability of Asian carriers.