NEW YORK — A man who fled to Thailand after allegedly tossing his dead 7-month-old son into a river has been returned to New York and arrested. James Currie, 37, was escorted off a plane at Kennedy Airport late Thursday and turned over to police and border agents. He faces a likely arraignment Friday on charges of concealing a human corpse. The Bronx father is accused of throwing the lifeless body of his son, Mason Saldana, into the East River near the Brooklyn Bridge last Sunday.