49ers Star Aldon Smith -- Ready to Explode ... On Way Out of Jail

San Francisco 49ers superstar Aldon Smith managed to contain his anger on the way out of jail yesterday after he was busted for making a bomb threat ... and TMZ Sports has the only video.

We shot Aldon leaving an LAPD station Sunday after he was arrested and booked for making a false bomb threat at LAX ... he looked pissed. Really, really pissed.

But despite his obvious frustration, Smith let his lawyer do the talking on the way out of jail ... keeping his mouth shut, unlike he did during the incident.

Smith faces up to one year behind bars if convicted.