As an FO, I had a paid EC seat on a CRJ900 when bought (yes, I bought it for a 2+ hour flight for $9.50, worth it IMO as I'm 10% on successful upgrades this year). Now I see the flight schedule changed by 5 min, but also included an equipment downgrade to CRJ-100 which has no EC or FC seats.

Of course, I should be entitled to the $9.50 refund, but is it worth the fight to argue for a flight change sans fees to something that does have EC?