What's the Next Surprise from al Qaeda?

Intelligence agencies say that last September they may have discovered a dry run for the package bombs found Friday in the UK and Dubai. All the intercepted packages contained were books, papers, CD's and household items, and they were allowed to continue to their destinations. Both recent incidents involved shipments from Yemen bound for Chicago, and it's now presumed the bombs were designed to explode in the air. We hear more about the former Guantanamo Bay prisoner who tipped off Saudi intelligence, al Qaeda in the Arabian Peninsula and politics in Yemen. Is there any way to protect the multi-billion dollar air-cargo system that's a mainstay of the global economy?