HAVANA — Two sailboats that went missing carrying humanitarian aid from southern Mexico to Cuba landed in Havana on Saturday afternoon hours after Mexico's navy said it had located them days after they went incommunicado because of bad weather. The vessels, carrying at least eight people, departed from Isla Mujeres in southern Mexico on March 20 and then lost contact, fueling concern in Mexico, Cuba and beyond. In a post on X on Saturday morning, the navy said an aircraft spotted the boats 80