Crisis-hit Boeing has rushed to defend itself from fresh whistleblower allegations of poor practice, as the airline continues to grapple its latest safety crisis.

A Congressional investigation heard evidence on Wednesday on the safety culture and manufacturing standards at the company – rocked in January by a mid-air scare that saw an Alaska Airlines 737 MAX 9 flight suffer a panel blowout.

One Boeing quality engineer, Sam Salehpour, told members of a Senate subcommittee that Boeing was taking shortcuts to bolster production levels that could lead to jetliners breaking apart.

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He said of Boeing’s 787 Dreamliner, that has more than 1,000 in use across airlines globally including at British Airways, that excessive force was used to jam together sections of fuselage.

He claimed the extra force could compromise the carbon-composite material used for the plane’s frame.

“They are putting out defective airplanes,” he concluded, while adding that he was threatened when he raised concerns about the issue.

The engineer said he studied Boeing’s own data and concluded “that the company is taking manufacturing shortcuts on the 787 programme that could significantly reduce the airplane’s safety and the life cycle”.

Boeing denied his claims surrounding both the Dreamliner’s structural integrity and that factory workers jumped on sections of fuselage to force them to align.

Two Boeing engineering executives said this week that its testing and inspections regimes have found no signs of fatigue or cracking in the composite panels, saying they were almost impervious to fatigue.

The company’s track record is facing fresh scrutiny amid criticism from regulators and safety officials alike in the wake of the incident aboard the Alaska Airlines plane.

It has become a trust issue again after the worst period in Boeing’s history when two fatal crashes, both involving MAX 8 aircraft, left 346 people dead in 2018 and 2019.

All 737 MAX 8 planes were grounded for almost two years while a fix to flawed flight control software was implemented.

A separate Senate commerce committee heard on Wednesday from members of an expert panel that found serious flaws in Boeing’s safety culture.

One of the panel members, MIT aeronautics lecturer Javier de Luis, said employees hear Boeing leadership talk about safety, but workers feel pressure to push planes through the factory as fast as they can.

In talking to Boeing workers, he said he heard “there was a very real fear of payback and retribution if you held your ground”.

Pressure on Boeing to focus on safety has included restrictions placed on production, limiting its manufacturing output.

At the same time, it is still facing three separate investigations by the Federal Aviation Administration, the Justice Department and the National Transportation Safety Board relating to the panel blowout.

A management shake-up announced amid the inquiries will see the chief executive depart the company by the year’s end.

Sky News has approached British Airways for comment.

Joe Biden has suggested his uncle may have been eaten by cannibals after his plane was shot down during the Second World War – as he said Donald Trump was unworthy of serving as commander in chief again.

The US president visited a war memorial near his Pennsylvania hometown to honour his late uncle Ambrose J Finnegan’s service in the conflict.

“He flew single-engine planes, reconnaissance flights over New Guinea. He had volunteered because someone couldn’t make it. He got shot down in an area where there were a lot of cannibals in New Guinea at the time,” Mr Biden told reporters afterwards.

“They never recovered his body.”

But there appears to be no record of his uncle’s death being the result of hostile action or any indication that cannibals played any role in the inability to recover his remains, according to the US defence department.

Military records show he was killed when the reconnaissance plane he was in crashed in the Pacific Ocean off the northern coast of New Guinea in May 1944 after engine failure.

“We have a tradition in my family my grandfather started,” Mr Biden said. “When you visit a gravesite of a family member – it’s going to sound strange to you – but you say three Hail Marys. And that’s what I was doing at the site.”

He attempted to draw a contrast between his family’s record of sacrifice to remarks allegedly made by Mr Trump that fallen service members were “suckers” and “losers”.

Former aides to Mr Trump have said he made the comments when he did not want to visit a cemetery for American war dead in France during his first term as president in 2018.

Mr Trump has denied making those remarks.

The president said Mr Trump – the presumptive Republican candidate to take on Mr Biden in November’s presidential election – “doesn’t deserve to have been the commander in chief for my son, my uncle.”

Mr Biden’s elder son, Beau, died in 2015 of brain cancer. The president has linked his son’s death to his year-long deployment in Iraq, where the military used burn pits to dispose of waste.

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White House spokesman Andrew Bates said in a statement to Sky’s US partner network NBC News that the president was “proud of his uncle’s service in uniform, who lost his life when the military aircraft he was on crashed in the Pacific after taking off near New Guinea.”

He added: “The president highlighted his uncle’s story as he made the case for honouring our ‘sacred commitment… to equip those we send to war and take care of them and their families when they come home’, and as he reiterated that the last thing American veterans are is ‘suckers’ or ‘losers’.”

Mr Bates did not comment on the cannibalism claim.

A judge in Donald Trump’s hush money trial has warned the former president about “intimidating” potential jurors in the case.

Justice Juan Merchan warned he would not tolerate Trump speaking while potential jurors were questioned in court on Tuesday.

He said the former president was audibly uttering something while his lawyers were questioning prospective jury members, and warned: “I will not have any jurors intimidated in the courtroom.”

The first six jurors were selected to serve on Tuesday afternoon on the panel of 12 jurors and six alternates in the historic trial.

They include a waiter, an oncology nurse, an attorney, an IT consultant, a teacher and a software engineer.

Several others had been excused on Tuesday morning after saying they could not be impartial or because they had other commitments.

Others demurred when asked about their opinions of Trump, including one who said is personal views on the former president “has absolutely no bearing on the case that you’re presenting or defending. That is a separate thing”.

Dozens of potential jurors have yet to be questioned.

The judge also ruled on Tuesday that lawyers are allowed to ask prospective jurors about their social media posts.

That ruling came after Trump’s lawyer Todd Blanche told the judge he had found several social media posts he said come from possible jurors that are “very much contrary to the answers they gave”.

Potential jurors have also been asked about where they consume their news, their opinions on Trump and whether they follow politics.

The hush money case is the first of Trump‘s four criminal cases to go to trial and may be the only one that could reach a verdict before the presidential vote in November.

If convicted, Trump – the presumptive Republican presidential nominee – would become the first former US president convicted of a crime.

He has pleaded not guilty to 34 felony counts of falsifying business records as part of an alleged effort to keep salacious and, he says, bogus stories about his sex life from emerging during his 2016 campaign.

Trump has claimed the trial is the result of a politically motivated justice system working to deprive him of another term as president.

Before entering the courtroom this morning, he stopped briefly to address a TV camera in the hallway, repeating his claim that the judge is biased against him.

“This is a trial that should have never been brought,” Trump said.

Among the potential jurors dismissed on Tuesday was a woman who had previously notified the judge she had a trip planned around Memorial Day.

A man was excused after saying he could not be impartial.

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Another man, who works at an accounting firm, was dismissed after saying he feared his ability to be impartial could be compromised by “unconscious bias” from growing up in Texas and working in finance with people who “intellectually tend to slant Republican”.

Jury selection could take several more days – or even weeks – in New York, which is a heavily Democratic city.

Around a third of the 96 people in the first panel of potential jurors in court on Monday remained after the judge excused some members.

More than half were excused after saying they could not be fair and impartial, and several others were dismissed for other reasons that were not disclosed.

The trial centres on $130,000 (£104,400) in payments that Trump’s company made to his then-lawyer, Michael Cohen.

He paid that sum on Trump’s behalf to keep porn actress Stormy Daniels from going public with her claims of a sexual encounter with Trump a decade earlier.

The former president has denied the sexual encounter ever happened.

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Prosecutors say the payments – which they claim were falsely logged as legal fees – were part of a scheme to bury damaging stories Trump feared could help his opponent in the 2016 race, particularly as his reputation was suffering at the time from comments he had made about women.

Trump said the payments, which he acknowledged reimbursing Mr Cohen for, were designed to stop Ms Daniels from going public about the alleged encounter.

The former president previously said it had nothing to do with the 2016 campaign.

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If convicted of falsifying business records, Trump faces up to four years in prison, though there is no guarantee he will get time behind bars.

His three other legal cases, involving allegations of election interference and hoarding classified documents, could lead to lengthy prison sentences.

But those cases are tied up with appeals or other issues that make it increasingly unlikely they will be decided before the election.

If Trump wins in November, he could order a new attorney general to dismiss his federal cases.