Investigators are attempting to determine why the right rear landing gear on a United Airlines jet failed to open properly on Sunday, forcing an emergency landing at Newark Liberty International Airport. According to passengers on the Airbus A319, the pilot calmly announced "a little problem" with the landing gear and instructed everyone on board to assume the brace position. The plane landed smoothly on its front and left-rear wheels before scraping its right wing on the tarmac where the landing gear failed to deploy. After exiting the aircraft on emergency slides, passengers said the crew did "a beautiful job." Said one frequent flier: "I've had a lot of worse landings at Newark before."