How can I remove a tripped pentalobe screw out of a Macbook Air?

Use one of these:

http://www.amazon.com/HDE-Point-Pentalobe-Screwdriver-Macbook/dp/B009K690LA/ref= sr_1_11?ie=UTF8&qid=1430482091&sr=8-11&keywords=apple+pentalobe+screwdriver

Or take the Mac to an Apple store genius bar and have them do it for you. It will probably be at no cost.

Ciao.

A stripped screw can ruin your day. Removing it will be tedious and may require a screw extractor designed for Lilliputians. Finding one of them will be hard enough. The larger challenge will be avoiding making it worse.

Bring your MBA to Apple first. If they offer to fix it, thank them profusely and offer pay whatever they want. It will be worth it.

Personally wouldn't touch a stripped pentalobe screw for less than the cost of a brand new MBA. I'm serious.