This is all that is coming up for me under 15K miles. I believe you can only use the 30K redemptions with status.
Code:
Departure Flight Options
Nashville , TN , US To Denver , CO , US Sunday, 24 August 08
Depart: Sunday, 24 August 08 Frontier Airlines
05:39 PM Nashville , TN , US (BNA) Non-Stop / F9235
Arrive: Sunday, 24 August 08 Airbus A319
07:25 PM Denver , CO , US (DEN)
Return Flight Options
Denver , CO , US To Nashville , TN , US Friday, 29 August 08
Depart: Friday, 29 August 08 Frontier Airlines
06:50 PM Denver , CO , US (DEN) Non-Stop / F9237
Arrive: Friday, 29 August 08 Airbus A319
10:20 PM Nashville , TN , US (BNA)
Depart: Friday, 29 August 08 Frontier Airlines
08:35 PM Denver , CO , US (DEN) Non-Stop / F9230
Arrive: Saturday, 30 August 08 Airbus A319
12:08 AM Nashville , TN , US (BNA)