What is prominent about Al Qaeda is not simply that it's a terrorist group; but rather, a patient terrorist network w/grandiose, detailed operations.
Al Qaeda moves in a continuum of multiplied impact. Note that it went from attempting to blow up one of the Twin Towers on Clinton's watch to both towers plus the Pentagon and another prime target to boot years later. No, I don't think Al Qaeda's current plans are limited to simply buildings, anymore. They are bloodthirsty for entire cities; regions; economically they want to take us all down.
If y'all don't believe in a personal demonic entity, now's the time to reconsider. The original rebel, according to foremost authority Jesus Christ, comes to "kill, steal, and destroy." (Book of John). Jesus didn't add "destroy" to "kill" just to be redundant. The enemies of our souls are both flesh and blood (terrorists) as well as spiritual entities invisible to us (those the terrorists ultimately represent). Their mark is universally the same: They all come to "kill, steal, and destroy."
Just as the Messiah authenticated the One we don't see, our Father in heaven; the anti-christs represent the Hidden (Occultic) One. Please note, the apostle John didn't only talk about a forthcoming THE anti-Christ, he discussed anti-christs (plural): "...as you have heard that the antichrist is coming, even now many antichrists have come." (1 John 2:18).
Based on your premise, I would look for places like stadiums, ballparks, Cathedrals and other mass gatherings to be targets.
They would have a field day of rich targets on New Years Eve.