Airlines are installing lie-flat seats in business class and additional seating in economy class. Last year, Boeing delivered almost 70% of its 777s with 10 seats per row in economy cabins instead of nine. Tom O'Toole, United's senior vice president of marketing and loyalty for United-Continental Holdings Inc., said the airline recognizes that customers have varying needs. "We are mindful that we serve a wide range of customer types and our aircraft need to be configured accordingly," he said. He added that seat width isn't the only consideration for passenger comfort, noting the airline has received very positive feedback from customers regarding its Dreamliner cabin features.