Dec. 25 (UPI) -- Mild weather is predicted in most parts of the United States, but travelers in the Pacific Northwest, central southern states and the Midwest might encounter bad weather and delays Thursday. Air travel through Chicago and other Midwest airports might be delayed due to freezing rain and fog, which also could make driving dangerous at times. Advertisement "Across the Midwest, areas of rain and drizzle and the potential for widespread fog could produce slower-than-normal travel