I still see Midwest planes at DEN all the time. Is Frontier using them and if so is there any designation while booking?

Also do they still have the same ol leather seats, 2 wide, or have they gone to Frontier's seats?

Midwest and Frontier were both purchased by the same parent corporation, RJET. They have been merged and the remaining Midwest planes you see are ones that have not been painted yet. They all have 2x2 leather seating (most are still blue I believe), the only distinction is that some of the STRETCH seating on those birds is still 2x1 with wider seats and a bulkhead after row 4.

Embraer E190 AircraftOperated by Republic Airlines for Frontier Airlines.

Image Registration # Name Animal Notes
(N161HL) Clover Fawn Formerly on N808FR
(N162HL) Casey Coyote Formerly on N316FL
(N163HQ) Blaze Red Fox Formerly on N823MD
(N164HQ) Hamilton Hummingbird Formerly on N913FR
N165HQ Aircraft currently in YX Colors
(N166HQ) Unnamed Puffin Formerly on N309FL
(N167HQ) Mo & Jo Kit Fox Pups Formerly on N804FR
N168HQ Aircraft currently in YX Colors
(N169HQ) Ollie Great Grey Owl Currently on N805FR as well
(N170HQ) Humphrey American Bison Formerly on N806FR
N171HQ Aircraft currently in YX Colors
(N172HQ) Stu Eastern Cottontail Currently on N803FR as well
N173HQ RAH House Colors
(N174HQ) Buddy Badger
(N175HQ) Lucy Canadian Goose Formerly on N909FR