The ornamental design for a plane, as shown and described.
FIG. 1 is a perspective view from above and one side showing the plane with a blade cover in place;
FIG. 2 is a perspective view thereof from below and the other side;
FIG. 3 is a top plan view thereof;
FIG. 4 is an end view thereof from left to right as viewed in FIG. 3;
FIG. 5 is an end view thereof from right to left as viewed in FIG. 3;
FIG. 6 is a side view thereof;
FIG. 7 is an exploded view thereof;
FIG. 8 is a view from above and one side showing the blade cover removed and stored; and,
FIG. 9 is a view from underneath one side with the blade cover removed showing a first stage in rotating the bottom plate from a use position to a storage position.
The dashed lines in the drawings are directed to features of the plane that form no part of the claim.