Two US airlines, America West Airlines and Northwest Airlines, are testing the idea of selling food on their flights. America West has begun a three-week trial of selling meals on certain flights, while Northwest Airlines is starting its own test period next week. America West's trial has started out with a choice of two snack selection boxes, costing US$3-5 and including items such as cheese, crackers, nuts, sandwiches and chocolate bars, but will progress to three $5 breakfast, lunch and dinner choices next week on certain flights, with $10 dinner menus such as chicken kiev or beef tenderloin being offered the following week.