The lack of niacin may also be observed in pandemic deficiency disease, which is caused by a lack of five crucial vitamins (niacin, vitamin C, thiamin, vitamin D, and vitamin A) and is usually found in areas of widespread poverty and malnutrition.
Singapore Airlines Airbus A340-500. Singapore Airlines Flight 21 was the longest regularly scheduled non-stop flight in the world, from 28 June 2004 until it was discontinued on 23 November 2013. It flew from Newark Liberty International Airport to Singapore Changi Airport, covering 9,534 miles (15,343 km) in about 18.5 hours flight time. It was operated by an Airbus A340-500. Flight 21 was scheduled to take off from Newark at 23:00 EDT (11:00 SGT) and land in Singapore at 4:05 SGT (16:05 EDT).
At 8,446 miles, Unitedâs San Francisco-Singapore route will bump out Deltaâs 8,439-mile route between Atlanta and Johannesburg as the longest route to be flown by a U.S. carrier, according to data from OAG and the Great Circle Mapper website.