I've read at least several times that when a passenger accepts a VDB/IDB, they can earn miles for the original itinerary, even when it results in flying on a different airline. So I know there are cases where earning EQMs on the original itinerary prevails.

With that in mind, several months ago, I was scheduled on a flight TYS-DTW-LAX, but missed the flight on account of heavy traffic getting to the airport. The GA was very helpful in rebooking me TYS-MEM-LAX. I was a bit bummed at the time thinking I'd lose out on some of the EQMs from my original flight, but when the flights posted, I was actually credited miles for the original segments, not the actual flights taken (this of course, worked out in my favor.)

My question is, was that a fluke or not?

I'm doing the same trip again this weekend, but scheduled to come home TYS-MEM-LAX. I see there's an earlier flight that appears to have plenty of room going TYS-DTW-LAX. If I am able to change to this route via FlyNow, will I only receive miles for the original itinerary or will I (or better, should I) get miles for the actual flights flown. (Yes, this is reverse of the circumstances from a few months back... but I want to know if I can have my cake and eat it too??)