(February 7, 2018, 1:20 PM EST) -- LOS ANGELES — A customer on Feb. 2 sued Spirit Airlines Inc. in a California federal court, alleging that it violated California’s unfair competition law (UCL) and engaged in false advertising by misrepresenting that its products are the least expensive available (Nikki Giavasis v. Spirit Airlines, Inc., No. 2:18-cv-864, C.D. Calif.)....