Since 1975, upwards of 60 civilian aircraft have been hit by surface-to-air missile platforms known as man-portable air defense systems (MANPADS), resulting in the deaths of over 1,000 civilians. Terrorist groups like al-Qaeda, the Islamic State in Iraq and Syria, and Lebanese Hezbollah are thought to possess MANPADS, presenting an ongoing concern for civilian air travel in the modern political climate. Although a MANPADS attack on a civilian aircraft has not been attempted since 2007, the threat of MANPADS attacks remains, and so does the need to develop a better understanding of the security risks posed by these systems. The loss of life from a MANPADS incident could be severe and have grave international repercussions. The research summarized in this report aims to provide analysis of the key issues of this international security challenge.