AAR is trading 5.5% down at $109.70 after-hours, with no clear company-specific announcement or catalyst identified. - AAR closed at $116.11 on September 25 after a 3.69% regular-session drop. - The company has scheduled its fiscal 2027 first-quarter results for September 29; earnings are upcoming, not a release explaining the move. - The broader market rose during the session, while the provided defense-sector surge moved in the opposite direction, leaving the decline unexplained by those trends.