MONTREAL — Major Canadian airlines have suspended service to Cuba as the Caribbean country faces a worsening energy crisis amid a U.S. blockade of oil.

Air Canada, WestJet and Air Transat each said on Monday that they were cancelling flights to Cuba, citing a shortage of aviation fuel.

All three airlines said they had plans to bring travellers home to Canada.

Air Canada said it made the decision “following advisories issued by governments regarding the unreliability of the aviation fuel supply at Cuban airports,” adding that it would dispatch empty flights southbound to pick up about 3,000 travellers to bring them home.

“It is projected that as of Feb. 10 aviation fuel will not be commercially available at the island’s airports,” Air Canada said in a news release.

WestJet followed suit later Monday after initially saying it intended to continue flights as planned, announcing it had suspended sales for service to Cuba and cancelled scheduled trips.

The airline said the decision would affect WestJet, Sunwing Vacations, WestJet Vacations and Vacances WestJet Québec.

Air Transat also initially said its flights would operate as scheduled but reversed course Monday evening.

“We are currently organizing a return plan to Canada, which includes regular flights as well as additional repatriation flights,” it said in a notice on its website.

Cuba is rationing energy as the administration of U.S. President Donald Trump cuts the island off from its traditional fuel sources. Trump is seeking to isolate Cuba and further ramp up the pressure on the country, a longtime adversary under strict economic sanctions from Washington.

Trump has said the Cuban government is ready to fall, and that the island would receive no more oil shipments from Venezuela after a U.S. military operation deposed former Venezuelan president Nicolás Maduro.

Last month, Trump signed an executive order allowing for tariffs on goods from countries that sell or provide oil to Cuba.

The Canadian government upgraded its travel advisory on Feb. 4 for Cuba, urging travellers to “exercise a high degree of caution” because of worsening shortages of electricity, fuel and basic needs like food, water and medicine.

“The situation is unpredictable and could deteriorate, disrupting flight availability on short notice,” Global Affairs Canada warned.

Air Transat said it was suspending all flights to Cuba until April 30. Air Canada and WestJet did not say when they would resume flights, only that they would continue monitoring the situation.

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