I'm showing differences in availability between FS and ETR, and its been this way since last Thursday.
Do a search for availability, DTW->AMS for Sept 29 on DL. Notice that every flight is showing LUTE9 availability. Now do a search using ETR for the same thing and ask for L U T E classes. Now things are different and look more realistic. Which one is correct, and how do I know if FS is showing me complete crap for any other flights? Also if you call Delta and speak with them about availability it looks as if the ETR data is either wrong or massively out of date.

What is the proper way for me to interpret this?