HAVANA, Cuba (AP) — Drivers in Cuba are facing the prospects of waiting several months to refuel their cars, as fuel shortages caused by a U.S. oil siege intensify. To avoid chaos outside gas stations, Cuba’s government last week made it obligatory for drivers to use an app known as Ticket to get refueling appointments. But drivers in Havana told The Associated Press on Monday that the app is only awarding them appointments several weeks or months from now.