FIG. 1 is a top perspective view of a first embodiment of an ornamental design of an aircraft;
FIG. 2 is a front elevational view of the first embodiment of the ornamental design of the aircraft;
FIG. 3 is a rear elevational view of the first embodiment of the ornamental design of the aircraft;
FIG. 4 is a side elevational view of the first embodiment of the ornamental design of the aircraft;
FIG. 5 is another side elevational view of the first embodiment of the ornamental design of the aircraft;
FIG. 6 is a top plan view of the first embodiment of the ornamental design of the aircraft;
FIG. 7 is a bottom plan view of the first embodiment of the ornamental design of the aircraft;
FIG. 8 is a top perspective view of a second embodiment of an ornamental design of an aircraft;
FIG. 9 is a front elevational view of the second embodiment of the ornamental design of the aircraft;
FIG. 10 is a rear elevational view of the second embodiment of the ornamental design of the aircraft;
FIG. 11 is a side elevational view of the second embodiment of the ornamental design of the aircraft;
FIG. 12 is another side elevational view of the second embodiment of the ornamental design of the aircraft;
FIG. 13 is a top plan view of the second embodiment of the ornamental design of the aircraft; and,
FIG. 14 is a bottom plan view of the second embodiment of the ornamental design of the aircraft.
In the drawings, the broken lines depict portions of the aircraft that form no part of the claimed design. The dot and dashed lines define the bounds of the claimed subject matter and form no part thereof.