Most people do not look at the breakdown when they are buying their trips. Loaded in a one way with a connection is the up to $46 (2@$23) Carrier Interface Charge. You can buy your ticket at the airport to avoid this charge. Only catch is you do not get the Discount Den fare. My guess this is where the extra money Frontier is collecting. This could add up to $92 in tax free revenue for Frontier on a round trip.