Long-standing concerns about military helicopters flying in crowded airspace and worries over short staffing among federal aviation workers have emerged as key factors in investigators’ inquiry into the fatal midair crash between an Army helicopter and a commercial airliner earlier this year.

Memes and online posts in support of 26-year-old Luigi Mangione, who's charged with killing UnitedHealthcare's CEO, have mushroomed online.

Nearly 50 years after skyjacker D.