It is a different flight and a different flight number. It's also a commuter airline instead of a mainline jet. But the agent interpreted this as a schedule change and refused to refund it. She said I could take my chances and ask for a refund through the web, which will take two weeks to process.
So call back and say you’ve been changed to Eagle from Mainline. A change of carrier, such as this, allows a full refund under DOT rules. Doesn’t matter how long or short the schedule change.