(Adds details, background in paragraphs 3-11, comment from NATCA) * Air traffic absences accounted for 6.6% of delays Thursday * Airlines are worried about serious problems over the weekend * Union chief says some controllers work second jobs to pay bills By David Shepardson PHILADELPHIA, Oct 24 (Reuters) – U.S. Transportation Secretary Sean Duffy on Friday said he expects more flights to be delayed, with air traffic controllers set to miss their first paycheck as a federal government shutdown enters its 24th day. Some 13,000 air traffic controllers and about 50,000 Transportation Security Administration officers must work without pay during the government shutdown. Controllers will miss their first full paycheck on Tuesday. "I think as we get closer to Tuesday and then after, I think you'

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