Is the trackpad in the Mac Air connected to the keyboard? My wife spilled a little water on her Mac Air -- MD760ll/A which we got in August 2013 (just outside of any AppleCare warranty).  At first it was completely dead, but I removed the back and battery and sopped up the water and used a desiccant in a sealed box to dry it out even further.

Now it turns on, but the keyboard and trackpad don't work, however I can use the Mac with a USB keyboard/mouse.

Is the trackpad connected to the keyboard?  If that's the case is there the possibility that I would only need to replace the keyboard?
I'm sorry to hear about your wife's MacBook Air; it's always frustrating when accidents like that happen. According to this step in iFixit's teardown of the 2013 Air, it appears that the trackpad is attached to the motherboard, instead of the keyboard:



Again, best of luck with the repair of the MacBook. If she can do without for a little while, waiting for a refresh in the line may be worthwhile, depending on the extent of water damage that isn't readily apparent (water damage can manifest weeks or even months after the fact.)