Lessor International Lease Finance has expressed interest in the higher-density configuration options of the Airbus A320neo family.
Airbus has previously disclosed plans to increase the seating capacity of the A321neo from 220 to 236 by rejigging the doors and internal layout.
ILFC has ordered 50 more A320neos to take its total commitment to 150 of the re-engined aircraft family.
"We are interested in the A320neo high-density aircraft, in some sense, for our customers," says ILFC chief Henri Courpron. "This is an option that will be appealing to the low-cost carriers, so we're ready to customise our order that way."
ILFC has previously placed A320neo aircraft with US low-cost carrier Spirit Airlines.