Two pilots have filed lawsuits alleging sexual harassment by the billionaire behind LaCroix sparkling water, claiming 82-year-old Nick A. Caporella inappropriately touched them on multiple trips while they were flying with him in the cockpit of his business jet.

The allegations by the former employees, both men, were made in lawsuits filed in the past two years in Florida and name both the chief executive and National Beverage Corp. as defendants. Mr. Caporella is the chairman, chief executive and controlling shareholder of...