An aircraft has a fuselage and a plurality of lifting surfaces, each of the lifting surfaces comprise a portion fixedly attached to the fuselage and a portion pivotally mounted on the fixed portion for angular displacement about a spanwise axis, a power means mounted on the pivoted portion. The power means includes a compressor. The pivotally mounted portion is provided with a boundary layer removal slot and duct, means leading from the compressor to the slot for removing the boundary layer air.
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