All of American’s transatlantic business class flying is supposed to be done with fully lie flat seats. That’s part of their joint venture with British Airways, Iberia, and Finnair. And it’s the message they’ve been sending to their customers.
That was supposed to happen a long time ago. But it’s been significantly delayed and still isn’t being projected for Boeing 777s until the end of next year.
American also flies some Boeing 757s across the Atlantic and it was reported nearly two years ago that these would get lie flat seats, too.