On November 12, 2014, about 2020 central standard time (CST), a Cessna 172K airplane, N46707, was reported missing near Lake Pontchartrain, Louisiana. The flight instructor and commercial pilot were both fatally injured. Damage to the airplane is unknown. The airplane was registered to Blue Dot Aviation and operated by a private individual as a 14 Code of Federal Regulations Part 91 instructional flight. Night visual meteorological conditions prevailed for the flight and an instrument flight rules flight plan had been filed. The local flight originated from the Lakefront Airport (KNEW), New Orleans, Louisiana, about 2015. An emergency locator beacon signal has not been reported.According to preliminary information from the Federal Aviation Administration, about 2015 CST, the pilot was given clearance to depart KNEW. The pilot later radioed that he was airborne. A few minutes later, the pilot requested a return to the Lakefront Airport. There are no reports of a distress call. At 1953, an automated weather reporting station located at KNEW reported a wind from 010 degrees at 18 knots, visibility 10 miles, an overcast sky at 1,000 feet, temperature 52° Fahrenheit (F), dew point 46° F, and a barometric pressure of 30.17 inches of mercury. The deceased occupants were located in Lake Pontchartrain on November 19 and on November 21, the search for the airplane was suspended.