Originally Posted by
MikeFromMKE
I think he meant can he earn skymiles on a frontier operated flight. I believe the answer is yes, as long as you book through Midwest Airlines and get a YX ticket, not a Frontier ticket.
Of course, if you do that, you might pay a higher fare than if you booked directly with Frontier. I guess it depends on how much the Delta miles is worth to you vs. Frontier or AirTran miles (which is all that Frontier offers for flights booked directly with them).