Spirit Airline name change policy helps passengers – change their names or make corrections in their names, on their airline tickets. It's the guidelines that mandate, Likewise, this process can only be done through the sanctioned Spirit Airline channels. No third party can change or correct the name of the passenger on a booking. Thus, it may involve some charges/ freights.

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https://www.travomonk.com/name-change/spirit-airlines-name-change/