An aircraft having a lambda-box wing configuration includes, a fuselage, a propulsion system, a first pair of swept-back airfoils, connected to the top forward portion of the fuselage, a second pair of swept-forward airfoils, connected to the lower rear portion of the fuselage at a point of the said fuselage aft of the connection of the swept-back airfoils, and a third pair of substantially vertical airfoils, the tips of the swept-forward airfoils being connected to the lower side of the swept-back airfoils at an intermediate point of the span of the said swept-back airfoils, by the substantially vertical airfoils, the swept-back airfoils having a higher aspect ratio than that of the swept-forward airfoils, which makes the swept-back airfoils have a reduced induced drag without penalizing their weight.
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