The ornamental design for combined engines and tailwing for a plane, as shown and described.
FIG. 1 is a top and left, rear perspective view of a combined engines and tailwing for a plane, showing the design thereof; and,
FIG. 2 is a top and right, front perspective view thereof.
The phantom-line and/or broken-line depictions in FIGS. 1 and 2 are shown for environmental and illustrative purposes only, and form no part of the claimed design of the present invention. Also, the exhaust rings shown in FIGS. 1 and 2 are shown for environmental and illustrative purposes only, and form no part of the claimed design of the present invention.