AAR Corp's stock fell 5.51% during the trading session, marking a significant decline for the aerospace and defense company.

The plunge came after the company reported fourth-quarter financial results that showed adjusted earnings per share of $1.27, missing the analyst consensus estimate of $1.38 by approximately 7.97%. While quarterly sales of $928 million exceeded expectations of $868.54 million, representing a 23% year-over-year increase, investors focused on the earnings shortfall.

Market reaction in post-market trading was negative as the earnings miss overshadowed the strong revenue performance, leading to the stock's decline despite the company's overall growth in both its parts supply and repair, engineering and software segments.