Volanic ash from the Caribbean island of Montserrat disrupted airport traffic in Puerto Rico Saturday, prompting delays and cancellations by several airlines. Most of the problems were in the small airport in the southern city of Ponce, but four Delta Airlines flights were canceled in San Juan, on the north coast, said Fred Sosa, the general manager of the capital’s Luis Munos Marin International Airport. Most flights out of San Juan were unaffected, Sosa said. Full Story