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bsder
Because nobody wants to pay for the technology to track a plane before the plane goes missing.
kinofcain
The assisted GPS thing is incorrect and missed the point. Assisted GPS just uses cell towers to speed the acquisition/interpretation of a satellite signal(s) and to use those cell towers to triangulate when satellites aren't available. The reason it doesn't help is because it's a GPS receiver, it's a bit like saying your TV can't be used to locate your house because your tv only gets VHF.
Giraffenstein
I'm going to out on a limb and suggest it's because technology doesn't track our every move.
goblin89
Saying that it's technology that tracks our every move IMO is a little disingenuous, too. ‘Technology’ does what people use it for.

If people in charge were really determined to track every commercial aircraft in the air, could this have been implemented with currently available means? I would believe so.