In Maryland, MTA=Mass Transit Administration, the people who operate the busses and subway trains. Although I don't know the locations of their towers, it would make sense that they might have one in the Glen Burnie area, since their busses run as far south as Annapolis. The (new) BWI tower belongs to the MdTA - the Maryland Transportation Authority - the people who police BWI Airport, the Port of Baltimore, and toll tunnels and bridges throughout the state. I sort of doubt that the MSP would use the MdTA tower at BWI... although it's right down the street, it's awfully short...
CA
Annapolis