Air Canada has temporarily suspended all flights from Toronto and Montreal to New York’s John F Kennedy airport, from June 1 to October 25, citing rising fuel prices.

Meanwhile, on April 17, Spirit Airlines asked the U.S. federal government for hundreds of millions of dollars in emergency funding to offset the surge in fuel costs, according to the Air Current industry website, citing unnamed sources.

The Guardian says there are growing concerns that other airlines worldwide may reduce services as aviation fuel costs climb while the U.S. and Iran wrestle with each other over the freedom of movement of ships carrying fuel and other products through the Strait of Hormuz.

“Jet fuel prices have doubled since the start of the Iran conflict, affecting some lower profitability routes and flights which now are no longer economically feasible,” Air Canada said in a statement on April 17. “Schedule adjustments including some frequency reductions are being made in response.”

Air Canada has also announced temporary suspensions to a Salt Lake City-Toronto route, which will be halted June 30, with plans to resume in 2027, as well as a delay to the launch of a service from Guadalajara, Mexico, to Montreal.

The Guardian also reports that the U.K.-based budget airline easyJet recently said it expected a pre-tax loss of £540 million-£560 million ($702 million-$728 million) for the six-month period ending in March.