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To achieve high-speed performance, a swept-wing or delta-wing planform is typically adopted, but these wing designs are inefficient at low speeds.
en.wikipedia.org As a swept-wing aircraft slows toward the stall speed of the wing, the angle of the leading edge forces some of the airflow sidewise, toward the wing tip.
en.wikipedia.org The long, slender wings are much straighter than current airliners that still use the swept-wing design left over from those original jet airliners.
www.wired.com This is of particular concern with swept-wing aircraft, whose wingtips could hit the runway on rotation/touchdown.
en.wikipedia.org Jet engines these days burn much less fuel at slightly slower speeds than the original designs that influenced the swept-wing designs of the '50s and '60s.
www.wired.com