TransAsia Airways has exercised options for six Airbus A321neo aircraft, bringing its total order for the type to 12.
These aircraft will be powered by Pratt & Whitney PW1100G engines, says Airbus.
The new jets are part of the Taiwanese carrier's fleet expansion plan and will allow it to develop new regional routes, it adds.
No financial details of the deal were available.
"The A321neo is a perfect fit for our strategy to grow efficiently in both domestic and regional markets and is the ideal solution to our fleet needs," says TransAsia chairman Vincent Lin.
TransAsia operates a fleet of nine A320 family aircraft, two Airbus A330-300s and nine ATR72-500s. Besides the 12 A321neos, it also has six sharklet-equipped A321s and eight ATR72-600s on order.