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There have been buildings that were taken over, but the people that have done so are stuck in them. They don't have absolute control over them. Many buildings have infrastructure in place for just such an event. The buildings are stationary. They're fairly tough. They get a fairly predictable set of people, so when you target a building you target not the populace but a fairly identifiable subgroup.
You have a plane, you have a self-contained system with control over it. You can move it from place to place, at least in theory. The people are there with just what they have in their carry-on luggage--little chance of having a security system in there, of calling the cops and having them show up mid-flight. And the population density per square yard is really, really high, meaning there are a lot of people to hold hostage, to kill, and you don't have to go hunting them down room to room.
The passengers are also unarmed. With a decent number of women and children. Try that in a normal building. You have to do something like in Beslan, going after a school. That's what you may *want* to do, but you have to worry about PR back home and have plausible deniability for those over-eager to deny the plausible.
There's the terror aspect. It's random. You have no idea that the plane you'll be flying isn't targeted. There's no rhyme or reason as to who's affected. With buildings, just stay out of post offices and you're fine (okay, that was tongue in cheek). Makes for better stories because nearly everybody can find somebody in their group on a plane. Lots of personal interest stories.
Lots of people are a bit uneasy about flying anyway. May as well leverage that unease. Most people don't have a problem with just being in a building.
Planes are easy to destroy. Ever see a picture of a plane that caught fire? Much of the metal, at high enough temperatures, burns. They can be crashed, and the debris field makes for really rather spectacular visuals. And you know that when you die from either fire or crashing there's a lot of fear that preceded it, after they knew they were doomed: It's different from having a maniac with a gun, he might decide not to fire the thing and kill you, or you might be just wounded. Conflagrations on a plane are tough to put out; it's not always easy to just change your mind and decide not to crash a plane.
Then there's the added wrinkle that you can't generally pilot a building into another building. "Watch out, we have to shoot that post office down before the guy veers it into that skyscraper."
There's always tradition. You may notice a kind of cultural bias to most hijackings set in once they stopped being really, really fashionable. Even if they're not special in practical terms, they're special because we're conditioned to see them as special. And because to be able to blow one up means that the security apparatus has failed so the president and law enforcement folk are properly humiliated, and that kind of humiliation can be a potent force. Not so much in the US, but many a Muslim terrorist's ethnocentrism can be overlooked since they have much larger problems.
Now, you can do the same with boats and ships, but it's harder to get really good TV coverage, there are more rooms, and fewer really juicy victims.
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