Because of the US oil embargo, refueling plane in Cuba will in all probability not be attainable from Tuesday. The airline Air Canada is subsequently suspending flights to the Caribbean island in the meanwhile. Other airways are additionally reacting.
https://www.spiegel.de/wirtschaft/oel-blockade-der-usa-unter-donald-trump-kerosin-auf-kuba-wird-knapp-air-canada-stoppt-fluege-a-95ff1799-2981-4b4a-92e1-422955ff4385#ref=rss