BERLIN—Demand for transatlantic flights has jumped since the United States announced plans last week to reopen to fully vaccinated travellers from countries including most of Europe, German airline Lufthansa said on Tuesday. On some days last week, bookings for transatlantic flights were up threefold from the week before, with demand on some routes nearing pre-crisis levels, it said in a statement. The United States said last week it would reopen in November to air travellers from 33 countries including China, India, Brazil and most of Europe who are fully vaccinated against COVID-19. For the large traditional European airline players, such as British Airways-owner IAG, Lufthansa and Air France-KLM, the decision represents a chance to recover the transatlantic routes that are key to their profits. Lufthansa said bookings for December flights to the United States reached pre-crisis levels last week. Both leisure and business travellers snapped up tickets for flights from Zurich …