As of now, there's no difference between "E" class and "T" class, that I know of. It has been speculated about here, that, perhaps in the new program year, "E" fares may have a lower mileage earning level - - but I emphasize, that this is ONLY speculation. If you're looking at December, you should be good to go! After January or February - - who knows, the way things are these days!!! ANYTHING is up for grabs!

edited to add . . . With any luck, they'll let us know on Feb 29 as to what's in store beginning March 1.