Virgin Atlantic, Hawaiin Air, Alaskan Air, seem to still be able to churn. Jet Blue?? Wyndham?? not sure..the list continues to dwindle..

Reddit has reports that Amex lifetime is 4 years now.

Citi is now 24 months, some chase cards can be done every 24 months

unfortunately, churning as we knew it no longer exists. I just wonder if the credit card companies will change as their number of new customers dwindles.