United Flight Makes Emergency Landing in LA After Hydraulic Failure
• United flight from SFO to Mexico City made emergency landing in LA due to hydraulic failure
• Flight 821 landed safely; 105 passengers & 5 crew members were on board
• This is 4th recent incident with a United jet - runway skid in Houston, wheel came off above SFO, engine flames over Texas
• United says Airbus 320 has 3 hydraulic systems for redundancy
• Passengers continued trip to Mexico City on new flight departing soon