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I apply (i) a classical version of the Ermakov-Lewis procedure and (ii) thestrictly isospectral supersymmetric approach to the Schroedinger free fall ofthe bouncing ball type. In both cases, the Airy function Bi, which in generalis eliminated as being unphysical, plays a well-defined role. Relevant plotsare displayedComment: 5 pages, twocolumn, 7 eps figs of which 6 to be published, accepted  at Physica Script

Gravitational Bouncing of a quantum Ball: Room for Airy's FunctionBi