I made an in-person purchase at the Atlanta airport recently and everything was per usual with no CIC or additional fees charged. There was a long line in the mid-morning when I was there. After waiting in the pre-line staging area by the baggage claim and then in the bag check line a friendly agent happily sold me a ticket while she trained a new agent on the process. It took about an hour or so from start to finish but I was at the airport anyway so I didn't mind. I would recommend going earlier in the morning or later in the evening. Mid-day seems to be a busy push for Frontier in Atlanta.