The crashing of a commercial jet into a mountain apparently by a pilot apparently suffering from depression is, to all but the most depraved, a tragedy. (My thoughts and sympathies go to the families of the victims, and hope they can find peace in the aftermath of their loss.)
Terrorism is the concept of generating fear in others to attain power. To use fear to control the actions (or words) of others. And terrorists are not above using the events of others, or those of random events in nature, to their advantage. Rabbis have used tragedy like the terror attack in Ma’alot in 1974 to prove the results of irreligiousity (in this example, fairly “centrist” Orthodox Jewish leaders). Christians have often called out events as “signs” that people weren’t towing the line they’d drawn: Hurricane Sandy, local tornadoes… heck, ANY wind! . Makes me wonder why the Westies are singled out for their acts of idiocy. Muslims, Hindus, Buddhists… everyone’s got the “believe or god will smite you” groove going.
So… every religion has adherents, not always at the extremes, who are terrorists: scaring people into doing what they want or be smote by god in a random meteorological or criminal event.