A federal lawsuit surrounding the collapse of a hangar at the Boise Airport in January has been filed, with allegations against construction companies for unsafe practices. The lawsuit blames the contractors for making rushed modifications to building blueprints without city approval, using poorly welded materials, and ignoring worker reports of structural issues and dangerous conditions. The construction companies involved, including Big D Builders and Steel Building Systems, are defendants in the lawsuit seeking $30 million in damages. Investigations are ongoing, with concerns raised about the safety of the structure, weather conditions on the day of the collapse, and potential violations of OSHA regulations.