I think DL used 727s and maybe MD-80 series to SLC from YVR. DL did use the 727 as its equipment of choice to YYC and YEG, but I have seen DL 737-300s at YEG from time to time before DL pulled out. They were probably equipment changes. It's unlikely DL will ever return to YEG in the near future. Besides, the loss of service wasn't that terribly missed by Edmonton Airports, surprisingly. This was because the vast majority of passngers at YEG were using SLC as a connection point, mostly to LAX and other US cities. And AC already was offering that kind of service, only it was via Denver. However, the service by AC to DEN is doing very well. The same goes for YEG-LAX nonstop. But as 777YYC said, Skywest still does fly to YYC and YVR.