The reservation code is essential information. Service fees may apply for qualifying refund requests. Your presentation acknowledges understanding of these. Frontier Airlines is a discount airline that operates in the United States and internationally. As one of the largest commercial airlines in the US, it is not surprising that Frontier Airlines receives many requests for customer service. We will provide point of contact information for travelers with special needs at our ticket counters, gate, by calling our Reservations Department at 1888-588-2434, or by completing an online form.