MIAMI — During the 2016 Investor Day, United said it would defer 65 Boeing 737-700s on order, originally due for delivery in two years. The move is seen to reduce capital expenditure by $1.6 billion through 2018.

While the Chicago-based carrier did not announce the deferral date, it was know that these 61 orders will be converted to the forthcoming 737 MAX 9 aircraft, and four to Boeing 737-800s.

Last January, United announced an order for 40 Boeing 737-700s, intended to replace some of the smaller, older planes, operated by its regional carriers. The order was further complemented with 25 additional aircraft, intended to replace part of the smaller, older planes, operated by its regional carriers.

“We constantly work with our airline customers to meet their evolving needs, and our healthy 737 backlog of 4,321 airplanes gives us the flexibility to meet those needs,” Boeing said in a statement.

The company also said it signed a firm order for 24 Embraer E175s, transferred from Republic Airways Holdings (Republic), currently in Embraer’s backlog. These 24 aircraft, valued at $1.08 billion at list prices, have been scheduled for delivery in 2017.

Besides the E175 order, United currently has firm orders for 35 Airbus A350-1000s, three Airbus A319s, 163 aircraft from the Boeing 737 family, 14 Boeing 777-300ERs, and 25 Boeing 787s.