I've had several FL flights credited over to F9 recently. Only one went through automatically though and I had to make calls to both F9 and FL.

After those calls, I believe the best way to get F9 ER credit for flights on FL is to call FL. If you explain the issue to FL, they will look up your flights and "send" them over to F9. That seemed easier than calling F9 directly. They all showed up within a few days after my call.

In terms of treatment on FL for F9 elites, it varies widely. At LGA and DEN, I was upgraded to business class. At MKE, they weren't aware of the partnership. At ATL, they said upgrades are not included.

I suppose with the stretch product, the FL business class and F9 Stretch products are fairly comparable and out to be part of the partnership. Of course, since the merged F9 is a head on head competitor with FL at MKE, this partnership is not long for this world.