Since a low relative thickness keeps wave drag down (a drag component which occurs only in supersonic flow), this makes delta wings especially attractive for supersonic aircraft. The large root chord gives the delta wing a high internal fuel volume even at a low relative thickness.

Why are delta wings used for supersonic?

Delta wings are used in many aircraft which fly at supersonic speeds. ... At sufficiently high angles of attack, the leading edge vortices above a delta wing undergo a vigorous form of flow discontinuity known as vortex breakdown.

Can a flying wing go supersonic?

This can actually result in higher drag and thus lower efficiency than a conventional design. ... The problem becomes more acute at supersonic speeds, where the drag of a thick wing rises sharply and it is essential for the wing to be made thin. No supersonic flying wing has ever been built.