The U.S. Supreme Court on Monday declined to hear a St. Louis-based natural gas company's appeal of a lower court's decision that could close a pipeline that runs through parts of Illinois and Missouri.The court rejected Spire Inc.'s appeal without comment. Spire President Scott Smith pledged to continue fighting to keep the 65-mile pipeline up and running.The Federal Energy Regulatory Commission granted approval for the pipeline in 2018 and it became fully operational in 2019. The Spire STL Pipeline connects …