The U.S. was ranked 19th, down a notch from last year, on the U.N.'s World Happiness Report.
The 29-year veteran is also accused of using a police database to view personal information and pictures of two women.
"Amazingly," no one was injured, police said.
All 54 passengers who survived the crash were hospitalized.
Paul Caneiro is facing 16 counts, including four counts of first-degree murder.
Find out who's charged, what schools were involved, who orchestrated the whole plot and what has happened since the charges were announced.