Generally it is not possible to arrange the wing so it will lie entirely outside the supersonic airflow and still have good subsonic performance. Some aircraft, like the English Electric Lightning are tuned almost entirely for high-speed flight and feature highly swept wings that make little to no compromise for the low-speed problems that such a profile creates. In other cases the use of variable geometry wings, as on the Grumman F-14 Tomcat and Panavia Tornado, allows an aircraft to move the wing to keep it at the most efficient angle regardless of speed, although the drawbacks incurred of increased complexity and weight have led to this being a rare feature.