For North America, it's only happening in California. At this time, LAX seems to be getting the 4-class 77W with F, whereas SFO (all flights) do not have F, but at the same time since it's every single flight is operating daily like before (that can change in months or so),
There was a time YVR flights also had either F or no F as well as YYZ. They're still bringing back multiple 77W from ASP and some 77C are getting converted back to a regular passenger jet. Still feel that could happen based on the rate of 77W coming back.