One of four men accused of plotting to kill thousands and cause an economic catastrophe by blowing up John F. Kennedy International Airport pleaded guilty to a lesser charge Tuesday, the day before his federal trial was to begin. In heavily accented English and sometimes through tears, Abdel Nur, of Guyana, admitted that he provided material support of terrorists, a charge that was not in the original indictment against him. The lesser charge spares him a possible life sentence. Instead, he now faces up to 15 years in prison. Nur admitted he told co-defendants Kareem Ibrahim, Abdul Kadir and Russell Defreitas that he would provide them with protection and guidance on a trip to Trinidad and Tobago in May 2007 to buy supplies. "I understand the destruction of the fuel and planes was to cause major economic loss in the U.S.," he said, reading from a statement. His plea did not include plotting to kill people.