OK, in the aftermath of this thread, I emailed Delta and requested original routing credit, as suggested above.

I got a reply apologizing for the delays. I can't quite tell if they're saying they will offer me the original credit or not.

But they said they will give me 10,000 miles because of the inconvenience I experienced.

So I logged on to delta.com and see that they've given me 10,000 miles (non MQM of course).

But the MQMs I got for the trip are still the same, only ATL-LHR instead of ATL-ARN. So I'm missing out on about 400 MQMs, plus the Double MQM promo or about 800 MQMs.

Hmm, I don't know if I should press on. The 10k miles are nice but the MQMs ...

Well if I get the Double MQMs for my trips in May and June, I will be Gold again.

But those 800 MQMs might make the difference on whether I shoot for Platinum this year.

Fire off an email simply stating:

"Iam requesting original routing credit for the folliwing itinerary (CONFIRM #, TICKET NUMBER) in which my routing was effected by operations."

Then give them the flights you wanted credit for.

shouldn't that be affected?

Yes but no. The ticket # will allow the agent to verify the originally booked itinerary and give them access to the reasons why the routing changed.

I had a problem where WX caused DL to sign my ticket over to AA (thank you MCI CRC agent) and I emailed DL CS via the website. Corrected itin appeared the next day.

lol i was just being a grammar dictator. affected vs effected...

LOL. Some days I just don't look at my grammer ;-)

Ain't that true.

Thank you for your positive contribution to this forum. I look forward to your next bit of insight.