mine was repaired under AppleCare
Has anyone had success at the Apple Store getting the hinge tightened up?
Mine had increased "play" over time, though still wouldn't spontaneously close no matter how close the screen was to the keyboard.
Nonetheless, the screen tended to vibrate or wobble when I typed while the MBA was resting on my lap.
I neither called AppleCare nor spoke with a Genius.
I simply showed up to my local Apple Store and asked to "Quick Drop" my MBA for repair. The concierge hooked me up with a "specialist" who opened up a case # and asked me to type in the details of my repair request. (I also requested repair of a Super Drive with a frayed cord where it connects to the drive).
Later the same day, a repair Genius at the store said it the MBA hinge problem was a covered item and he needed my permission to ship it to the repair depot since that was not a repair they do locally.
They shipped it overnight, it was repaired the day it was received, shipped back overnight to my local store. Roundtrip was 48 hours.
The same repair genius at the store called me to inform me of the completed repair and they replaced my Super Drive with a new unit.
(Before it was shipped to the depot, I did ask if they would simply swap my unit out for a new one, but because it was the unit's first repair, they declined. I asked this because the week prior, the manager replaced my 1.5 year old iMac 24" that needed two things repaired with a BRAND NEW iMac 24" - list price of $1500. I did purchase ProCare and used it for both sets of repair requests, but I think it had the biggest effect on my iMac repair/replacement).
Big fan of AppleCare so far (had it for both the MBA and iMac).
UPDATE: after reviewing my AppleCare repair ticket, not only did they replace the hinges and bezel, but they replaced the logic board (I had complained about system slowing/spinning beach ball), the hard drive ("wouldn't mount" according to the technician), and the fan ("noisy/slow"). I practically have a new computer!