My A button is worn out and my D is headed there too, on my 2011, 13in!
That's positively weird. I'm not intending to get personal, but you've either typed 24/7 for two years, your fingers are unusually abrasive or it's a manufacturing error.
If the first two options are not the cause, then there might be a way (depending on where you're at) as some countries have extensive legislation on manufacturer's liability. For instance I could (here) probably make a good case for having the keyboard replaced based (free of charge) on the fact that the keyboard does not withstand its intended use.
Failing that, replacement of the keyboard is by no means an easy D-I-Y task. Even ifixit has no guide for that (only an upper case&keyboard - replacement) http://www.ifixit.com/Guide/MacBook+Air+13-Inch+Mid+2011+Upper+Case+Replacement/9427/1
Unless you really need the keyboard to look pristine, I'd leave it be...
RGDS,
SNIP.
I do notice that when I press the "A" key I use my pinkie finger's nail instead of the finger. Odd.
Even though you do not have AppleCare, the apple store can replace specific keys on most computers. I would make a genius bar Appt at your nearest store just to see how much it would run you so you can get it installed correctly and the new keys will be under warranty for 90 Days.
I think a nail fits my term "unusually abrasive".
RGDS,
Go to the Apple store - they'll probably have some spare keys lying around that they can put on. They can order spares of keys, but normally will just order a new TC.
Not sure if I believe bigbird888's story though - unless there's physical signs of abuse, broken key hinges is a covered issue.
I have attached three pictures: (1) condition of the keyboard, (2) initial quotation for replacement, (3) invoice after repair.
I have attached three pictures: (1) condition of the keyboard, (2) initial quotation for replacement, (3) invoice after repair.
Wow that's crazy - key caps that have broken off without signs of damage are a warranty issue.
I have a feeling they were trying to get a paid repair (where they can charge more) out of you.