The ornamental design for an aircraftdivan, as shown and described.
FIG. 1 is an upper front perspective view of the aircraft divan;
FIG. 2 is a front view of the divan shown in FIG. 1;
FIG. 3 is a right-end view of the divan shown in FIG. 1;
FIG. 4 is a left-end view of the divan shown in FIG. 1; and,
FIG. 5 is a top view of the divan shown in FIG. 1.
The broken lines shown in the figures represent portions of the divan that form no part of the claimed design. The bottom view and the back view of the divan form no part of the claimed subject matter and are therefore omitted.