One of the greatest budget airlines I have ever used is Spirit Airlines. Spirit Airlines BER Terminal has an excellent and very friendly customer service team. While there are many benefits to flying with Spirit Airlines, there are also some disadvantages. The primary drawback of flying with Spirit Airlines is that, in comparison to other airlines, they offer fewer amenities and services. One of the greatest budget airlines I have ever used is Spirit Airlines. It's nice that Spirit Airlines offers a range of aircraft with varying capacity. One of the greatest budget airlines I have ever used is Spirit Airlines. It's nice that Spirit Airlines offers a range of aircraft with varying capacity.