What about attacks by sea?
The following is lifted from a TIMEAsia article:
http://www.time.com/time/asia/magazine/article/0,13673,501030707-461898,00.html
" The Strait of Malacca, between Malaysia and Indonesia, is the world's busiest waterway, a maritime bottleneck that is only 2 km across at its narrowest point: hundreds of ships pass through each day, including those carrying almost all of Japan's oil from the Persian Gulf. Security is so loose that pirates hijack ships every week. "Most people in the business think an al-Qaeda-linked attack of some kind at sea is inevitable," says a senior maritime security official in Southeast Asia.
Last September, captured al-Qaeda operative Omar al-Faruq told U.S. interrogators that he had begun plotting a suicide attack against American vessels visiting Indonesia, but had to give it up due to a lack of local volunteers willing to sacrifice their lives. A scarier possibility is of terrorists hijacking an oil tanker or a ship carrying chemical or nuclear waste, which "regularly transit the Strait without any escort," the official says. That might not be a mere scenario: there have been three mysterious attacks on chemical tankers in the Strait in the past month. "It's particularly worrying that the attackers did little more than get on board, immobilize the crews and leave with a few token valuables," says a regional intelligence official. "They were almost like training exercises." If a terrorist blew up, say, a liquefied natural-gas carrier, the resulting blast would be like a mini nuke and could flatten an entire port. Singapore's Senior Minister Lee Kuan Yew was alarmed enough to issue a public warning last year about the dangers posed by seaborne attacks on the republic's port. "
Couldn't also short-range missiles be fired from the deck of a freighter? Or is this too sophisticated for JI or al Qaeda or whomever?