These have been my experiences with Delta/Song so far:
2 yrs. ago Song direct flight was cancelled never notified then moved to a Delta flight not good hrs. for us. I called had a rude CSR who really didn't offer any helpful solutions to the problem. I was upset almost cancelled the flights but hung up instead to regroup...didn't want to loose my excellent price. Called again got a great CSR who walked me through my options and settled on a Delta flight w/connection semi-decent hrs. kept great rate as the flight cancel was Delta's not mine so no increase in fare.
Spring forward to now....Made reservations in June for Jan. 06 flight on Song. The flight has had 6 changes made to it and each time I must call and reconfirm the seat assignments. I found the changes...I was never notified by Song about them. I really didn't expect to be. I had not been contacted 2 yrs. ago when my flight was cancelled 2wks. before the trip so I just always keep track of my flights less stress for me that way.
After 6 calls this is what I have learned from them:
Song flights should keep the same seat assignments if there has been a time change because the actual aircraft doesn't change (Song uses the same type of plane for all of their flights so there is no difference in the seat configuration)
If the flight has been cancelled then you may loose your original seat assignments if they move you to an all ready booked flight where your specific seats are assigned to another flyer so you can't have them. If your original seats from the cancelled flight are open on the new flight they will assign those to you but you still need to call to have it show up on your itinerary.
All bets are out the window if they move you from a Song flight to a Delta flight because the plane configuration will most likely not match your original seat assignement so you really need to be quick on the draw to try to get seats you think you might like.
Bottom line for me:
I check on line every day to see what changes may have been made then call to reconfirm the seat assignments if a change has happened. It only takes a couple of minutes to check this and I feel better knowing what is up. Most of the changes have taken place on a Sat./Sun. to the schedule but I still check daily because who really knows anymore?!!!
I would suggest people stay proactive on Delta/Song changes. If flight times and seat assignments are important to you (and they are to most people) keep checking on a regular basis to make sure you are keeping somewhere close to what you wanted in the first place.
Happy flying to us all!
Colleen