The practice leaves dangerous dregs in the jugs, which workers don't clean, Millsip added. The bottles then are picked up by unsuspecting Deer Park workers for refilling, he said. When he complained to supervisors about it, Millsip said, they threatened to discipline him. "It's a wrong practice all the way around," said Millsip, 30, of Southwest Philly. The lawsuit, which alleges a public nuisance, fraud and conspiracy, names American Airlines, US Airways (which recently merged with American) and nine airline officials as defendants. It seeks an injunction for the airline to cease operations until the top-filling practice ends and asks the court to appoint an investigator and overseer to ensure compliance. An American Airlines spokesman suggested the complaint was nothing more than a grudge by an overzealous attorney. "Mr. Mildenberg has brought several lawsuits against the company over the years that we found to be frivolous and that were ultimately dismissed," American Airlines spokesman Matt Miller said.