The ornamental design for a flyingwing, as shown and described.
FIG. 1 is a front perspective view of a flying wing showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear perspective view thereof;
FIG. 4 is a right side elevational view, the left side being a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The structural elements depicted by broken lines have been shown for the purpose of illustrating portions of the flying wing that form no part of the claimed design.