Tomorrow, I'm finishing one round trip flying from Hartford to IAH via EWR. Later in the afternoon, I'm starting a second round trip IAH to ATL. The trips are on cheap tickets purchased on separate dates (different confirmation numbers).

When I get to EWR tomorrow, is there any chance that CO would let me fly direct EWR to ATL? I know that I can do anything for enough $$. By "let me", I mean for free or for the standard same-day change fee plus not cancel my ATL to IAH return.

Thanks for any feedback.