Edelweiss, the Swiss airline that flies nonstop from Tampa International Airport to Zurich, has announced it will increase its flights from two to three per week. The additional service begins in June 2015, when Eidelweiss will operate on Tuesdays, Thursdays and Saturdays. "This is an effect of our success that we have seen on the route since its start," said Alain Chisari, Edelweiss chief commercial officer, in a statement. "Thanks to the great partnership we have with Tampa International…