I for one am quite baffled how hard it is for everyone to get EU compensation; the OP and Rene have been in lengthy battles for which it seems like forever. Maybe it's because it took my 6 months to hit DM or because I have amassed 200k RDMs in 8 months, but I had a similar incident when I was delayed in AMS when flying to ATL. I reached home nearly 6 hours after my original scheduled arrival. I submitted an online complaint form and in about 32 days I was notified that there would be a check in the mail for me. Any input in why Delta makes this such a lengthy battle for some?