An aerodynamic body that can be adjusted relative to a main wing of an aircraft by an adjusting device is provided. A gap between the aerodynamic body and another aerodynamic body or a component of the fuselage or the main wing is formed on one lateral end and said and the gap is variable due to the adjustability of the aerodynamic body. The body features a gap bridge-over device with a shell part that extends along the gap and overlaps the outer shell of the aerodynamic body in the wingspread direction on the front side thereof so that the shell part can be telescopically moved relative to this aerodynamic body in the wingspread direction. An airfoil for an aircraft with a main wing and a plurality of aerodynamic bodies that are arranged adjacent to one another transverse to the chord direction is also provided.