"They expect to have more information on the 'unified brand' later in Spring. Going to a unified brand is different than picking one name and dropping the other."
"As we get into the spring we will announce a unified brand process and then it will be an execution proces probably through the rest of the year."
This implies either one or both airline names will certainly be changing.
"Both Frontier and Midwest bring great brand value to us and we must work a path of using these brands that retains as much customer loyalty as we can."
This implies that both brands will be kept. I don't see how you can retain brand value by erasing the brands.
The only way both could happen is by creating a blended brand: either "Midwest Frontier" which sounds oxymoronic or "Frontier Midwest", which just sounds dumb. "Midwest/Frontier" or "Midwest+Frontier" isn't as oxymoronic but just doesn't seem to be a viable option to me.
Any guesses about what this "unified brand" might actually be?