Concerns that terrorists may be planning to attack passenger airplanes are prompting Israeli officials to expedite a plan to arm their airplanes with a system to divert missile fire.

It's an idea first debated after an attempted 2002 attack in which missiles were fired at a chartered Israeli airplane flying from Kenya. It has been held up, though, by budget issues.

The system is similar to that already used on fighter planes, releasing flares to divert any missiles fired at a plane. It reportedly has been installed on some El Al aircraft already.

There has been a spike in attempted terrorist attacks against Israel in recent months, and officials believe there may be plans to use shoulder-fired rockets to target commercial aviation.

CNN reports that a cache of Grinch SA-24 shoulder-launched missiles have gone missing in Libya. "They can shoot down a plane flying as high as 11,000 feet and can travel 19,000 feet straight out," the report said.

While other weapons smuggled out of Libya are believed to be heading to al-Qaida operatives, Israeli officials last week indicated some Libyan arms have been smuggled into Gaza.