For years, Spirit Airlines soared with a low-cost, no-frills business model. This week, it came in for a bumpy landing. WSJ's Alison Sider explains how the big airlines learned to compete with Spirit––and helped put the carrier in bankruptcy. Further Listening: -The Love Triangle Over Spirit Airlines -Frontier, Spirit and the Future of Low-Cost Airlines Further Reading: -How Spirit Airlines Went From Industry Maverick to Chapter 11 Bankruptcy -Discount Airline Spirit Files for Bankruptcy Learn more about your ad choices. Visit megaphone.fm/adchoices