Southwest Airlines’ LUV pilots’ union has filed a lawsuit against the company, alleging change in pay and working conditions imposed by the airline as a result of the pandemic.The lawsuit filed by the Southwest Airlines Pilots Association (“SWAPA”) in the federal court in Dallas, TX claims that the airline “significantly altered working conditions, rules, and pay rates for pilots” without any negotiation. Southwest, on the other, hand feels that measures taken by the company to tackle the coronavirus-induced challenges did not require negotiations.Southwest's vice president of labor relations, Russell McCrady, said in a statement to Business Insider, "As always, Southwest remains committed to Pilots' health and welfare and to working with SWAPA, and our other union partners, as we continue navigating the challenges presented by the ongoing pandemic.”Southwest Airlines Co. Price Southwest Airlines Co. price | Southwest Airlines Co. QuoteAs per reports, the pilots’ union is seeking an injunction so that the company goes back to the terms of their collective bargaining agreement.The lawsuit builds on Southwest’s ongoing troubles with its workers. Per a CNBC report, the carrier’s pilots’ union had, last month, warned of pickets at airports during the winter holidays to protest over poor work schedule and lack of proper accommodation and food.With Southwest already struggling with operational disruptions related to staffing, due to which the carrier will reduce flight schedules through the rest of the year, the latest issue with its workers only adds to its woes.Zacks Rank & Key PicksSouthwest carries a Zacks Rank #3 (Hold). Some better-ranked stocks in the airline space are Controladorav Vuela Compania de Aviacion, S.A.B. de C.V. VLRS, SkyWest, Inc. SKYW and Corporacion America Airports S.A. CAAP. While Controladora Vuela and SkyWest sport a Zacks Rank #1 (Strong Buy), Corporacion America Airports carries a Zacks Rank #2 (Buy). You can see the complete list of today’s Zacks #1 Rank stocks here.While shares of Controladora Vuela and Corporacion America Airports have rallied more than 100% in a year’s time, SkyWest shares have gained more than 35% over the same time frame. Infrastructure Stock Boom to Sweep America A massive push to rebuild the crumbling U.S. infrastructure will soon be underway. It’s bipartisan, urgent, and inevitable. Trillions will be spent. Fortunes will be made. The only question is “Will you get into the right stocks early when their growth potential is greatest?” Zacks has released a Special Report to help you do just that, and today it’s free. Discover 7 special companies that look to gain the most from construction and repair to roads, bridges, and buildings, plus cargo hauling and energy transformation on an almost unimaginable scale.Download FREE: How to Profit from Trillions on Spending for Infrastructure >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Southwest Airlines Co. (LUV): Free Stock Analysis Report SkyWest, Inc. (SKYW): Free Stock Analysis Report Controladora Vuela Compania de Aviacion, S.A.B. de C.V. (VLRS): Free Stock Analysis Report Corporacion America Airports S.A. (CAAP): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research