September 11, 2001, fundamentally changed the way the federal government and airports approach security matters. In recent years, the firm's lawyers have assisted proprietors in addressing their complex public safety and airport security imperatives. The firm has assisted in drafting security regulations, in developing improved security requirements, and in revising airport rules, regulations and minimum standards to address heightened security demands. Kaplan Kirsch & Rockwell lawyers have also worked to ensure that airports opting out of the federal security screening program are immune from liability for doing so, and have advised airports on the serious potential liability arising from participation in the registered traveler program. The firm's lawyers have worked with airports to resolve Letters of Investigation issued by TSA alleging security violations and have helped general aviation airports develop meaningful security programs in this emerging but largely unregulated area.