The ornamental design for a cabinet for a commercialaircraft passenger cabin lavatory, as shown and described.
FIG. 1 is a perspective view, taken from a front, left side, showing a cabinet for a commercial aircraft passenger cabin lavatory according to a first embodiment of our design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a right side elevation view thererof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a perspective view, taken from a front, right side, showing a cabinet for a commercial aircraft passenger cabin lavatory according to a second embodiment of our design;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a right side elevation view thererof; and,