I just flew Midway from IND-RDU-DEN in coach.
Outbound my RDU-DEN flight had 30 people in Coach and was fine (better than NWA), and returning there were somewhere in the mid 90s--thus making it more cramped, but not miserable. I'd say the 737 coach product on Midway beats coach on NWA and CAL.
The Canadair Regional Jets are a different story-- between IND and RDU I discovered that there is one type of plane where I do not want the window seat.
Adam
PS- Yes, I know it was backwards going from IND-RDU in order to go to DEN, but for double miles what the heck--and I saw an old friend at RDU.