The infamous flight 203 to Cali on November 27, 1989, was allegedly taken down by a bomb planted under orders from Pablo Escobar.

This is the government story.

However, further investigations imply the failure could have been the fault of a fuel pump and Boeing tried to cover it.

https://www.elespectador.com/noticias/nacional/avianca-203-h...

https://www.airliners.net/forum/viewtopic.php?t=598797

https://gosint.wordpress.com/2017/11/30/suspicious-aviation-...