The ornamental design for a credenza for aircraft, as shown and described.
FIG. 1 is a front perspective view of a credenza for aircraft;
FIG. 2 is a top view of the credenza;
FIG. 3 is a bottom view of the credenza;
FIG. 4 is a first side view of the credenza;
FIG. 5 is a second side view of the credenza;
FIG. 6 is a front view of the credenza; and,
FIG. 7 is a back view of the credenza.
In the drawings, broken lines immediately adjacent shaded surfaces represent boundaries of the claim and form no part thereof; all other broken lines depict unclaimed environmental subject matter and form no part of the claim.