Originally Posted by
pieperjm88
While its possible that the agent may have charged you I would doubt it. Every time I have bought tickets at the airport the agent has assigned me seats with whoever I was flying with free of charge. I would just compare the price online with the price you paid and then you'll know whether or not they charged you. It may also be itemized on the receipt they give you but I'm not sure since I've never paid for them.
So there is another benefit for buying at the airport. Does Spirit ever assign seats for you and those on the same booking at different places? If so this benefit for booking at the airport could be even more valuable.
I recently booked a flight for wife, myself and one-month old son on the same booking with Norwegian and they assigned us to different spots. The checkin agent managed to clear that up.