Thank you for your help, fti. I just had a short call with an extremely rude DL employee here. Appearentely, my "favorite" airline has handed over her itin to AF and is not responsible anymore. After some discussion the CSR revealed the new AF booking reference - and voilá - whole trip is accessable by by airfrance.com.

A notification of that would have been nice but hey ... she is just another paying customer who interferes with the big business so it seems ...