AN AMERICAN AIRLINES DC-10 flying nonstop from London to Dallas-Fort Worth with 242 people aboard landed safely Friday at Kennedy International Airport after flying the Atlantic with a blown tire and flap damages incurred on takeoff. . . . NINE ALBANIAN DISSIDENTS, all ethnic Greeks, crossed the border into Greece early Friday and sought political asylum, officials said. . . . CHINA'S COMMUNIST authorities have arrested two Roman Catholic bishops and 13 priests and deacons loyal to the pope.