The evidence is anecdotal, but psychologists and flight attendants say they’ve seen and heard increased worries about flying.

Kiah Duggins, a Washington civil-rights attorney, had returned to Wichita, Kan., where she attended high school and college, before boarding the ill-fated American Airlines plane that crashed.

Army officials said Thursday the pilots of the UH-60 Black Hawk helicopter that collided with the American Airlines jet had night-vision goggles and likely were wearing them at the time of the crash.