In the late 1980's, Boeing thoroughly redesigned the 747 with the -400 model, making major aerodynamic improvements, adding winglets to improve fuel efficiency, incorporating new avionics, installing a new flight deck and providing the latest in-flight entertainment systems. The 747-400 remains the world's fastest subsonic commercial jetliner, allowing passengers to arrive at their destinations nearly an hour sooner than passengers flying on competitor's airplanes.