By Ryan Fahey Terrified travellers screamed out after a fellow passenger started up coughing up “litres of blood” on the plane. The 63-year-old, whose name hasn’t been released, was travelling on a flight from Bangkok to Munich when his health rapidly deteriorated. Another passenger, Martin Missfelder, 53, from Zurich, recalled the “absolute horror” as “everyone was screaming”. After boarding, the man – who was travelling with his Filipina wife – started suffering “cold sweats” and his breathing became more rapid. Passengers rushed to his aid, giving him chamomile tea and trying to take his pu…