Do Airlines Outsource their Frequent Flyer Programs?

I’ve never noticed this before .. .or perhaps this is the first time it’s happening? Anyway, I’ve today I’ve received email statements from United, American, US Airways, Delta, Southwest and British Airways. Could this be a coincidence, or are all these airlines outsourcing the management of their Frequent Flyer program to the same provider?

I suspect Vinnie will know Thinking