A major step in rebuilding travel links between the United States and Venezuela has come with U.S. approval for a U.S. airline to begin commercial flights to the South American nation again. The U.S. Department of Transportation cleared American Airlines to resume service to Venezuela, ending a six‑plus‑year freeze on regular U.S.–Venezuela flights. American Airlines, through its regional unit Envoy Air, received U.S. government approval on March 4 to restart flights from Miami to Caracas and Maracaibo.…