Reading this post reminded me that just last week I noticed a $4000+ ecredit in my DL account as I was booking a flight. I tried to use it, but the transaction failed twice and I just used a credit card. After reading this I see that the credit is the exact same amount as a ticket I booked many months ago via Air France for travel next month on DL/KLM on a ATL-AMS-KGL-EBB-AMS-ATL itinerary. Delta is the first airline I fly on this itinerary.

All looks well for the booking on DL, KLM and AF sites. Will leave the ecredit alone and see what happens next month.