I claim the ornamental design for an aircraft window, as shown and described.
FIG. 1 is a top, front, right side perspective view of an aircraft window showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The stippled shading applied to the outer ring of the aircraft window represents a change in material that is different than that of the remaining portion of the aircraft window.