I did check CO from EWR, flight was much more expensive than DL. We have flown on NWA from DTW to AMS many times and connected to other cities throughout Europe. I am trying to avoid the 6:30 am or even 9am flight out of FCO for our return - no way around it if we connect through AMS. We can fly directly from Rome to JFK leaving in the afternoon, arriving back to JFK around 5:30 and then get a flight back to Detroit that same evening. I thought that Delta flights would get us the EQM but I am a little nervous after booking a CO flight earlier this year - we didn't check to see if the fare was eligible before booking and we did not receive all of our miles. We definitely don't want that to happen again!
Thanks for your replies.