Under intense pressure from shipping companies concerned about costly delays, the Coast Guard is tipping off some large commercial ships about security searches that had been a surprise, high-ranking Coast Guard officials have said. The searches began after the Sept. 11, 2001, terrorist attacks as part of a major revamping of the Coast Guard and its new anti-terrorism mission. But shipping companies say the surprise boardings at sea cause unnecessary delays, costing up to $40,000 an hour. “We're trying to facilitate commerce and keep the port secure – and sometimes the two conflict,” said Capt. Paul Wiedenhoeft, who is in...