You have an existing thread going on this trip -- Credits if change or cancel Canadian AF/KLM booked on DL?

As I noted in that thread, you can potentially book KL/AF fares on delta.com using ITA Matrix to lookup up fares and ITA Matrix Powertools browser extension -- https://chromewebstore.google.com/de...alononkolnplpp

There are currently Economy fares on KL/AF out of DTW that are cheaper than the DL Main fares out of YYZ if you want to fly out of Michigan/DTW. I was able to price out a combination of AF/DL fares on Google Flights that is bookable on delta.com without using ITA Matrix Powertools.

https://www.google.com/travel/flight...tnGwHXX627dVz7