One of the advantages of an aircraft with movable wings is that it can land on short runways with its wings in front, then take off with full load and reach supersonic speeds in a short time with its wings in the rear position.
The Mig-31, which emerged in the 1980s with an advanced radar system and capable of sending long-range missiles
US $320 Million Fully Loaded B-1 Lancer Takes off at Full Afterburner