Airbus made this announcement:

Icelandair, the main Icelandic airline based in Keflavik, has placed a firm order for 13 Airbus A321XLR. The order makes Icelandair a new Airbus customer. The airline is also planning to lease four A321LRs.

With its extra long range, the A321XLR will allow Icelandair to seize new market opportunities. The aircraft will also enable the airline to reduce its operating costs, support its sustainability targets and at the same time offer its passengers the best in cabin comfort.

Icelandair also made this announcement:

As previously announced, Icelandair and Airbus signed a Memorandum of Understanding for the purchase of Airbus A321XLR aircraft on 7 April 2023. The final purchase agreement has now been finalized. Icelandair has made 13 A321XLR firm orders and has purchase rights for up to 12 additional aircraft.

Deliveries will start in 2029. The agreed purchase price of the 13 aircraft is confidential. The financing of the aircraft is yet to be determined but the Company will explore financing options closer to the delivery dates. 

 
As previously announced, the Company has been in advanced discussions with aircraft lessors regarding a lease of A321LR aircraft. The Company has now finalized long-term lease agreements with SMBC Aviation Capital Limited, for four new A321LR aircraft, scheduled to be delivered from Airbus in the fourth quarter of 2024.