British Airways owner IAG on Friday unveiled plans to buy 71 long-haul aircraft from Airbus and Boeing , sharing a major fleet expansion across the Atlantic a day after Britain and the U.S. announced a trade deal.

IAG SA announced a major aircraft order for widebody jets, doubling down on a long-haul business that’s powered its earnings and helps the airline group upgrade from older models.

International Airlines Group (IAG) on May 9 announced an order for long-haul aircraft comprising 32 Boeing 787-10s for British Airways (BA) and 21 Airbus A330-900neos for Aer Lingus, Iberia and LEVEL. The order follows an agreement by the company made in March to purchase 18 aircraft, which was also...