Talkback - Which is the most vulnerable part in an airplane if it has bomb or terrorist attack?

With four men being arrested by AFP over the weekend for an alleged terrorism plot to bring down a plane, Ivan and Selina have invited a former plane engineer who looked after maintenance, Mr David Lee, to explain to us where is the most likely place if someone wanted to place a bomb in a plane and what safety check will airlines do before a plane takes off.

Cockpit of a passenger jet Source: flickr/Ruth Hartnup