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LONDON (BLOOMBERG) - Boarding passengers seated at the back of the aircraft first - a Covid-era change by US-based Delta Air Lines and others to cut the risk of infection - actually increases the chance of catching the virus by 50 per cent, a scientific study showed. So-called back-to-front boarding is also twice as risky as letting passengers on at random, even though it does reduce exposure between seated passengers and those walking down the plane, according to the study published Wednesday (April 28) in the Royal Society Open Science journal. The higher risk comes from closer contact between passengers in the same rows clustering in the aisle as they stow their luggage. Delta adopted back-to-front boarding to "minimise contact with other customers," according to its website, though the US airline only boards 10 passengers at a time. The change was among several across the industry - including blocking out middle seats - to persuade passengers it is safe to get back on a plane. Scientists from institutions including the University of West Florida and Florida State University simulated 16,000 possible passenger movements for the study. "The new policies do not improve on the old ones in