The ornamental design for an aircraftwindow, as shown and described.
FIG. 1 is a front and right side perspective view of an aircraft window according to my new design; and,
FIG. 2 is a front elevation view thereof.
Throughout the Figures, broken lines showing structure are for illustrative purposes only and form no part of the claimed design. Portions of the article not shown in the drawings form no part of the claimed design.