I'm not a Mac guy so please value my comments accordingly. The MacBook Air with its limited connectivity and no DVD drive seems like a poor machine for business use. As noted, it's also rather pricey for a 13-inch notebook. If price is not a concern since you're using points, then go with the MBP.

If price is a concern, I'd look at the Toshiba U405 family or wait a month or so and get the new Dell 13-inch Adamo.