The ornamental design for a convertibleairplane and automobile, substantially as shown and described.
FIG. 1 is a side perspective view, taken slightly from the front, of the
convertible airplane and automobile with the wings and tail extended in
flying position, showing my new design;
FIG. 2 is a side perspective view thereof, taken slightly from the rear and
also showing the wings and tail extended in flying position;
FIG. 3 is a side perspective view thereof, taken slightly from the front,
as in FIG. 1, but showing the wings and tail folded for ground surface
travel;
FIG. 4 is a rear elevational view thereof with the wings and tail extended
in flying position; and
FIG. 5 is a rear elevational view thereof with the wings and tail folded
for ground surface travel.