Not every single business building has full on wifi access. We have areas in our building where it would be nice to just plug in, and have internet access. Plus a lot of hotels are still plug in only, and the iPad is an ideal travel device. Plus if you live in a condo building with 30 other routers clogging traffic, some times it tends to slow down, and a hard line would be a nice option.
I am guessing though if it has USB ports on the new version, you will likely be able to use the extrernal ethernet adapter available for the Mac Air.
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