US lessor Air Lease Corp. (ALC) has placed a firm order for seven ATR 72-600s, previously listed on ATR’s order book as undisclosed, for delivery in 2016.

The deal, which was announced Tuesday at the Farnborough Airshow, marks Air Lease’s fourth consecutive annual ATR order since 2010. The deal takes ALC’s total ATR commitment from 21 to 28 aircraft.

“We have topped up with an additional order for new generation ATR 72-600s,” ALC chairman and CEO Steven Udvar-Házy said, speaking at a media briefing. “Not all seven aircraft have yet been contracted with airlines, but we have already made considerable progress and individual leases will be announced in due course.”

Házy remains interested in plans to manufacture a larger ATR, which are subject to approval from ATR shareholders Airbus and Finmeccanica. He also believes a denser ATR, which was mooted on Monday, would be popular among his airline customers.

“Certainly, if ATR can increase their capacity to 80 [seats], that’s an 11%-12% increase in capacity, meaning a lower seat kilometer cost for airlines. I think that would have certain applications, even in North America. I can see that for flights of up to 800 km, that could be a very effective airplane,” Házy said.

On Monday, Air Lease Corp. became the launch customer for the Airbus A330-900neo with an order for 25 of the type. On Tuesday, ALC ordered six Boeing 777-300ERs and has reconfirmed orders for 20 737 MAX 8 aircraft.