Yes, you can lie down in First Class on American Airlines, but only on specific aircraft equipped with lie-flat seats. This experience is branded as "Flagship® First" or "Flagship® Business" and is primarily available on long-haul international flights (to Europe, Asia, Australia, and South America) and premium transcontinental routes (like New York to Los Angeles). The seats in these cabins convert into a fully flat 2-meter bed (6'6") at the touch of a button. In 2026, American is also rolling out its new Flagship Suite® on Boeing 787-9 and Airbus A321XLR aircraft, which feature sliding privacy doors and even more space to stretch out. However, on standard "Domestic First Class" (short flights within the U.S. on smaller planes), the seats are typically large leather recliners that do not go flat. To ensure you can lay down, you must check that your flight is operated by a wide-body aircraft or a specially configured A321T/A321XLR.