They could easily set up a travel agency and get a thousand naive college kids on Spring Break to be taken hostage.
What’s old is new, again (Barbary Pirates circa. 18th & early 19th centuries). That’s where the line “to the shores of Tripoli” came from in the Marine Corps Hymn.
http://www.crf-usa.org/bria/bria18_1.htm
Dammit I wish somebody would invent satellites so we could track these ships /s
Of all Al Qaeda schemes I would think this would be the easiest to defend against.
Sink known Al Qaeda ships, arm merchant ships and/or have military ships in likely areas. The Somalia coast for instance.
It’s not like they can sneak up with any vigilance.