giblet

I was wondering if I can buy a US SIM card at any of the following airports:

MIA, ATL, DFW, RDU (in that order)

I'd prefer one I can get a data plan with. Last time I researched this, only AT&T offered that option but that was a couple of years ago.

Any suggestions? I'm going to be in the above airports for about 24 hours and would love to get phone/internet access.

Thanks!