LOS ANGELES - Airline passengers on July 3 asked a federal judge in California to grant preliminary approval to their July 3 settlement with Korean Air Lines Co. Ltd. on the passengers' claims that Korean Air conspired with Asiana Airlines Inc. to fix fares and fuel surcharges for passenger air transportation on flights between the United States and Korea (In re Korean Air Lines Co., Ltd. Antitrust Litigation $(All Actions$), MDL No. 07-01891, Master File No. CV 07-05107, C.D. Calif.).