F9 Adds "More Fees". But, Fares Going Down...

Bargain hunters could find themselves paying more to fly after low-cost carrier Frontier Airlines said it would start charging extra for carry-on bags.
The DEN based carrier said it simplified its price structure and cut its lowest economy fares by 12 percent. But customers taking advantage of the lower fares will now pay USD$20 to USD$50 more for a carry-on bag to store in the overhead bin, depending on whether the passenger books online or pays at the gate. Customers can carry on one personal item at no charge.

Prior to Monday's announcement, Frontier charged a carry-on fee for passengers who purchased on third-party websites.
Those who buy an economy fare will also have to pay additional fees for seats near the front of the plane and with more leg room. Those charges start at USD$3.

actually the cob fees have increased as of april 28th 2014
here is the link and depending on the fare purchased if you don't pay at the counter, you can pay up to $100.00 at the gate.
I know this because I work f9 codeshare flights and we have to charge those fees.
Frontier Airlines | Carry-on Baggage

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Originally Posted by ddagencylv

Bargain hunters could find themselves paying more to fly after low-cost carrier Frontier Airlines said it would start charging extra for carry-on bags.
The DEN based carrier said it simplified its price structure and cut its lowest economy fares by 12 percent. But customers taking advantage of the lower fares will now pay USD$20 to USD$50 more for a carry-on bag to store in the overhead bin, depending on whether the passenger books online or pays at the gate. Customers can carry on one personal item at no charge.

Prior to Monday's announcement, Frontier charged a carry-on fee for passengers who purchased on third-party websites.
Those who buy an economy fare will also have to pay additional fees for seats near the front of the plane and with more leg room. Those charges start at USD$3.

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ATY, they did indicate that but if you are not carrying a bag the fare has decreased. I only use them on OW confirmed and I will check in my bag with DL (wink)*.