FIG. 1 is a top perspective view of an inflatable air cushion showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The inflation means depicted by means of broken lines in FIGS. 1, 2, 4 and 5 is shown for illustrative purposes only and forms no part of the claimed design.