The Albany International Airport is adding another direct flight to Miami this winter. Frontier Airlines announced Tuesday that it will be starting twice-weekly service between ALB and MIA on Nov. 4. The flights will be on Thursdays and Sundays. The low-cost carrier currently offers nonstop flights from Albany to Denver and Orlando. The ALB-Miami nonstop is the second such flight announced recently — American Airlines announced in July that it will start service between the two airports this…