Frontier Airlines from June - September is adding capacity from a A319/320 to an A321 on selected routes through the summer. See below.

CVG– SAN 7/16/17 3x weekly
DEN – MKE 3x weekly

DTW – PHX 6/26/17 1x daily

MKE – LAS 9/7/17 1x daily

MCO – SJU 6/11/17 1x daily ***NEW ROUTE**

PHL – SJU 6/11/17 1X daily ***NEW ROUTE***

PIT – DEN 9/7/17 1X daily
PIT – LAS 1X daily