When Lincoln launched its original Navigator, it was America's first full-size luxury SUV. GM soon followed with the Chevy Tahoe-based Cadillac Escalade, and has followed with much-improved second- and third-generation versions. As expected, the battle was resumed a few years later with the launch of the significantly improved Navigator and long-bodied Navigator L in 2007, which still trail the Escalade in power but boast some advantages, namely the function and operation of their second- and third-row seats. Both rows fold flat into the floor, and the segment-exclusive PowerFold feature flattens the back row at the touch of a button.