Frontier airlines starts charging $100 for carry-on bag

Frontier airlines plans to start charging up to 100-dollars for a carry-on bag.

The new carry-on fee is for bags in the overhead bin, so small bags under the seat will still be free.  
Frontier says it will charge 25-dollars if the fee is paid in advance, but 100-dollars if travelers wait to pay until they're at the gate.
Frontier's new carry-on fee won't start until summer, though a date hasn't been set.
Frontier also announced it will charge two dollars for coffee, tea, soda, or juice.