a jet that's been hijacked flying at 600 miles will take about a minute and half to cross the entire country of israel. it's where israel's most populated cities are right along that coast. so israel has close to zero margin for error in encountering and protecting itself against a hijacked airplane. if this malaysian jet has been hijacked, there's a sense among israeli intelligence officials that is a possibility, then israel feels it has to take the necessary precautions. the government met with security officials this week and decided on a number of emergency measures. those remain classified, secret. but one has been published. foreign aircraft approaching israel's shores will have to identify themselves far earlier than has previously been the case. >> so idf thinks it is a possibility that this plane is being weaponized. >> they can't rule out that