Persistent and significant delays continue to affect airports across the United States as the unprecedented government shutdown extends into its 40th day.

Thousands of flights are experiencing disruptions nationwide due to a shortage of federal airport staff, creating widespread travel headaches as Thanksgiving approaches.

On Sunday alone, FlightAware reported that 1,181 flights within, into, or out of the U.S. were canceled, and an additional 871 faced delays.

Newark Liberty International Airport is the most severely affected, with a ground stop in place that has halted the arrival of hundreds of flights at the New Jersey hub this morning.

This situation requires all incoming flights to remain at their departure points until at least 8 a.m. Sunday. Over 500 flights destined for Newark have been held, and the ground stop may be extended, according to the FAA.

Meanwhile, flights due to land at Chicago O’Hare International Airport are experiencing an average delay of 1 hour 22 minutes, according to FlightAware. 

Lengthy delays are also impacting Anchorage International, with an average added wait time of 42 minutes, which is increasing by the minute. 

It comes as the government shutdown stretched into its 40th day on Sunday amid a fight over funding which has also impacted food assistance for millions of Americans and left 1.4 million federal workers, including those at airports, without pay. 

Major delays are still plaguing US airports as the government shutdown rages on, with thousands of travelers hit with major delays. A ground-stop has been issued for Newark Liberty International Airport (pictured) in New Jersey, impacting hundreds of flights Sunday

It comes as the government shutdown stretched into its 40th day on Sunday amid a fight over funding which left federal workers, including those at airports, without pay. (Pictured: Travelers line up amid major delays due to the shutdown at George Bush Airport in Houston)

With no end to the Senate stalemate in sight and Thanksgiving coming up on November 27, the travel chaos is likely to worsen in the coming weeks if lawmakers cannot come to an agreement to end the shutdown. 

More than 13,000 air traffic controllers have been required to work without pay since October 1. 

Transportation Secretary Sean Duffy spoke about the delays last week, blaming Democrats for the stalemate. 

‘I’ve been talking to air traffic controllers and there really is frustration. There’s a shutdown right now, the democrats are focusing on illegal healthcare,’ he told ABC News.

‘They don’t get paid as air traffic controllers. Those are burning frustrations, like in the rest of the country.’

Duffy added that ‘safety is his top priority’ and the administration will ‘delay’ and ‘cancel any kind of flight across the national airspace to make sure people are safe.’

‘There is a level of risk when we have a controller doing two jobs instead of one. We manage and look out for it,’ he said. 

The Ground Delay Program – an air traffic management plan – is expected to be implemented at Newark if delays continue. 

The probability of a ground stop extension on Sunday was ranked at ‘medium level,’ meaning the safety measure may remain in place for a few more hours. 

With no end to the Senate stalemate in sight and Thanksgiving just around the corner, the travel chaos is likely to worsen in the coming weeks if lawmakers cannot end the shutdown

The government shutdown began on October 1, when Republicans and Democrats could not agree to pass a bill funding federal services for the coming months.

The expiring Obamacare subsidies are the key sticking point. Democrats want the bill to include an extension of expiring tax credits which make health insurance cheaper for millions of Americans, and for a boost to Medicaid. 

Minority Leader of the Senate Chuck Schumer has repeatedly said that the party would be willing to negotiate an end to the shutdown should Republicans come to the table and talk about extending subsidies.

However, Republicans have said they want to negotiate the health insurance subsidies separately.  

Republicans hold 53 of the 100 seats in the Senate and need Democratic votes to pass any funding deal.

President Donald Trump has warned that he will start mass layoffs of federal workers if negotiations continue to stall.