A crazed United Airlines passenger has been arrested after allegedly attacking a flight attendant and trying to storm the cockpit as the plane landed at Newark Liberty International Airport. United Flight 1837 had just arriving from the Dominican Republic at around 6 p.m. Saturday when the pilot was forced to declare an emergency on board. Wild audio of the conversation between air traffic control and one of the crew members captures the chaotic scenes on arrival at the New Jersey hub. “We’re declaring an emergency, seems like someone just attacked one of our flight attendants,” the crew member tells air…