Many airlines offer such seats in international first class but retain inferior seating in business class to differentiate the two products and fares. British Airways, which introduced flat beds in first class in 1995, was among the first airlines to introduce fully flat business-class seats with its Club World product in 1999.[17] Herringbone seating, in which seats are positioned at an angle to the direction of travel, is used in some widebody cabins to allow direct aisle access for each seat and to allow a large number of fully flat seats to occupy a small cabin space. The concept was first developed by Virgin Atlantic for its Upper Class cabin and has since been used by Delta, Cathay Pacific, Air Canada and other airlines.[18] Cabin seat, These seats are designed to give the business-class traveler the most privacy they can attain while in flight.