ERJ Bases:
Orlando, New York (JFK), and Dulles (IAD)

CRJ Bases:

Dulles (IAD), Phoenix, Chicago, Houston, Charlotte, Nashville, and Hawaii(which has about 4 outstation bases.)

Dash 8 Bases:

New York, Denver, Grand Junction, and Phoenix

1900 Bases:

Too numerous to name... and constantly changing

Hope that helps.