Airlines across the US have begun cancelling flights in the coming days as the longest government shutdown in history disrupts air travel, forcing thousands of passengers to alter their plans.

With hundreds of flights already suspended by the country's four largest carriers, the nation's busiest aviation market has become a flashpoint in the ongoing battle between Republicans and Democrats over federal funding, as US President Donald Trump increases pressure to reach a deal, Bloomberg reported.

The Republican-led administration says the reductions are necessary to maintain flight safety amid staffing shortages caused by the shutdown, while at least one senior congressional Democrat has called for greater transparency to ensure the move isn't politically motivated.

Denver proposes to

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