I don’t know about this one, but I had to pay $70 for an extra 5 pounds 20 years ago.
Just flew Frontier this past weekend. Cheap tickets, unless you have a carry-on or checked bag. ($100 and $140 respectively, each way)
I got by with the free “personal item” with a backpack.
Frontier has sizing bins right at the gate, and questionable bags are asked to be placed in the sizers. Bags that don’t fit require a baggage fee to be paid prior to boarding.
This is a fantastic way to piss off your customers. Not only do they suffer embarrassment in front of other customers as they try to cram their bag in the sizer, and the financial impact of the bag fee, but they are now traveling with far less clothing and other personal items that they could likely have fit into regular luggage, for which they’ve now paid.
They are an economy airline. Seats packed like sardines, none of which recline. All in-flight beverages and snacks are at cost. Not even water is free.