The crash Sunday that killed the basketball superstar and eight others has highlighted the debate over the merits of the system, which some pilots believe is unnecessary and refer to its warnings as "nuisance alarms.''

Ara Zobayan's decision to proceed in deteriorating visibility has experts and fellow pilots wondering if he flew beyond the boundaries of good judgment and whether pressure to get his superstar client where he wanted to go played a role in the crash.

Eight other people died alongside Kobe Bryant, including his daughter Gianna and her basketball teammates.