United converts eight 737-900ER options

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United Airlines has converted eight Boeing 737-900ER options to firm orders.

The Chicago-based carrier has 91 firm orders and 52 options for the Boeing narrowbody following the move, according to Flightglobal's Ascend Online database. The aircraft will be powered by CFM56-7 engines.

United plans to use the 737-900ER to replace its domestic Boeing 757-200 fleet and less fuel efficient aircraft.

The additional aircraft are reflected in Boeing's orders and deliveries.

United did not comment by press time.