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The big news for Wednesday is Tesco and its annual results.
So make sure you log on to Business Live from 6.00am for all the breaking business and economic news and analysis.
The reckoning
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For United Airlines' parent company, United Continental Holdings, shares ended down 1.12% at $70.71 following an apology from its chief executive to the gentleman who was dragged off an "overbooked" flight on Sunday.
Video content
Video caption: Why was a passenger dragged off a US flight?Why was a passenger dragged off a US flight?
US stock markets close down
Getty ImagesCopyright: Getty Images
US stock markets concluded a volatile day of trading on Tuesday against a backdrop of geopolitical tensions between the US and Syria, Russia and North Korea.
The Dow Jones Industrial Average ended down 6.72 points at 20,651.30.
The S&P 500 lost 3.38 points at 2,353.78 and the Nasdaq finished 14.15 points lower at 5,866.77.
Paul Christopher, head global market strategist for Wells
Fargo Investment Institute, said: "Investors should get accustomed to uncertainty because of
US foreign policy questions and trade questions.
"The market will see
good days and bad days and end the year roughly where it is."
The hardest word
From falling as much as 4%, shares in United Airline's parent company United Continental Holdings are now down 1.5% after chief executive Oscar Munoz's second attempt at an apology.
As Wall Street heads towards the closing bell, here is what the company's shares have done today.
BBCCopyright: BBC
United share fall narrows on apology
Jayse D AnspachCopyright: Jayse D Anspach
That seems to have done the trick.
Shares in United Airlines-owner United Continental Holdings are regaining a little ground after chief executive Oscar Munoz issued another statement, this time "deeply" apologising to the customer who was forcibly removed from a flight.
Mr Munoz said in his second statement: "It's never too late to do the right thing."
Its shares are now down 2% at $70.05.
BreakingUnited boss: 'we take full responsibility'
United Airlines chief executive Oscar Munoz has issued another statement after a 69 year-old passenger was violently removed from one of its flights on Sunday.
This time, Mr Munoz says:
Quote Message: The truly horrific event that occurred on this flight has elicited many responses from all of us: outrage, anger, disappointment. I share all of those sentiments, and one above all: my deepest apologies for what happened. Like you, I continue to be disturbed by what happened on this flight and I deeply apologize to the customer forcibly removed and to all the customers aboard. No one should ever be mistreated this way. I want you to know that we take full responsibility and we will work to make it right. It’s never too late to do the right thing. I have committed to our customers and our employees that we are going to fix what’s broken so this never happens again. This will include a thorough review of crew movement, our policies for incentivizing volunteers in these situations, how we handle oversold situations and an examination of how we partner with airport authorities and local law enforcement. We’ll communicate the results of our review by 30 April. I promise you we will do better. Sincerely, Oscar
The truly horrific event that occurred on this flight has elicited many responses from all of us: outrage, anger, disappointment. I share all of those sentiments, and one above all: my deepest apologies for what happened. Like you, I continue to be disturbed by what happened on this flight and I deeply apologize to the customer forcibly removed and to all the customers aboard. No one should ever be mistreated this way. I want you to know that we take full responsibility and we will work to make it right. It’s never too late to do the right thing. I have committed to our customers and our employees that we are going to fix what’s broken so this never happens again. This will include a thorough review of crew movement, our policies for incentivizing volunteers in these situations, how we handle oversold situations and an examination of how we partner with airport authorities and local law enforcement. We’ll communicate the results of our review by 30 April. I promise you we will do better. Sincerely, Oscar
Bombardier ticks higher on train talk
Bombardier and Siemens are both keeping schtum on talk of a tie-up between their train operations but investors are excited.
Shares in Canada's Bombardier are currently 4.5% higher at C$2.32.
Investors believe United will weather the storm
Getty ImagesCopyright: Getty Images
Wall Street thinks United Airlines will survive the public relations crisis the business finds itself in.
Shares in its parent company, United Continental Holdings, are currently down 3% at $69.33.
Craig Hodges, portfolio manager at Hodges
Capital, said: "The company has a very black eye, and they need to do some
PR work, but I don't think it will have any effect on the
fundamentals."
United footage 'troubling', says Spicer
GCopyright: G
White House press secretary Sean Spicer says of the videos showing a United Airlines passenger being dragged out of his seat:
"It was an unfortunate incident, clearly when you watch the video it is troubling to see how that was handled.
"I don't think anyone looks at that video and isn't a little disturbed that another human being is treated that way.
He's "sure" that President Trump has seen the video - but doesn't want to make a statement that might prejudice the reviews being carried out by United and the Chicago police.
There are now more reports emerging that Siemens and Bombardier are in discussions about combining their rail businesses.
Reuters is reporting the talks and says a joint venture between the German and Canadian companies could give them strength against Chinese rival CRRC Corp.
There has been speculation in the past that Siemens and Bombardier have attempted to combine their rail operations, though this was denied by the Canadian firm.
Bombardier employs 3,500 people in the UK and among its customers has produced trains for London Underground.
Shares in United Airlines-owner United Continental Holdings have clawed back a bit of ground and are now down 2.7% at $69.59.
US tax reform will not be 'easy'
Getty ImagesCopyright: Getty Images
Stephen Schwarzman (L) and Donald TrumpImage caption: Stephen Schwarzman (L) and Donald Trump
Stephen Schwarzman, the chair of Donald Trump's Strategic and Policy Forum, is taking a cautious stance on tax reform.
Mr Schwarzman, who is also chairman and chief executive of private equity giant Blackstone, told FOX Business Network: "It’s a complicated area because to lower rates you have to raise revenue from areas and there are a lot of sacred cows that people don’t like to have taken away, whether they are mortgage deductions or charity deductions or deductibility of state and local taxes.
"And so, threading the needle on say a program that works on the numbers but also works politically is not particularly easy.”
Word of the day: volunteer
US dictionary publisher Merriam Webster has offered some help to United Airlines
Is Dialog Semiconductor about to suffer the same fate as UK chip designer Imagination Technologies?
German bank Bankhaus Lampe has reduced its rating on Dialog's shares from "hold" to "sell" because it reckons that Apple, which accounts for a major slice of its revenue, is developing its own chip for the iPhone.
It is feared Apple's own battery-saving chip could replace Dialog's power management integrated circuits as early as 2019.
Its shares fell by 14.3% but Dialog said it saw no reason for the fall and remain comfortable with its financial outlook for "good revenue growth" in 2017.
Mining stocks rise on flight to safety
Getty ImagesCopyright: Getty Images
Investors' rush to find a safe haven in gold helped send shares in precious metal miners to the top of the FTSE 100 on Tuesday.
Randgold Resources was the day's biggest riser, with its shares closing 4.63% higher at £75.65. It was followed by Fresnillo, whose shares rose 3.92% to £16.52.
Gold rose 1% to $1,266.96 an ounce.
The FTSE 100 closed up 23.18 points at 7,372.12.
The FTSE 250 ended Tuesday up 41.92 points at 19,306.52, led by JD Sports which reported record profits, sending its shares 8.24% to 440.10p.
Donald Trump has promised the chief executives of US businesses some "very pleasant surprises" on the North American Free Trade Agreement or Nafta. However, he declined to say what the surprises are.
The US President also reiterated a promise to "reduce taxes". His Treasury Secretary Steven Mnuchin promised "very significant" tax reform before the Congressional break in August.
United brand damage
The chief executive of pollsters Ipsos Mori tweets after shares in United Airlines' owner fall 4%, wiping more than $700m off its market value...
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Latest PostGood night
Thanks for joining us on today and for all your feedback.
The big news for Wednesday is Tesco and its annual results.
So make sure you log on to Business Live from 6.00am for all the breaking business and economic news and analysis.
The reckoning
For United Airlines' parent company, United Continental Holdings, shares ended down 1.12% at $70.71 following an apology from its chief executive to the gentleman who was dragged off an "overbooked" flight on Sunday.
Video content
US stock markets close down
US stock markets concluded a volatile day of trading on Tuesday against a backdrop of geopolitical tensions between the US and Syria, Russia and North Korea.
The Dow Jones Industrial Average ended down 6.72 points at 20,651.30.
The S&P 500 lost 3.38 points at 2,353.78 and the Nasdaq finished 14.15 points lower at 5,866.77.
Paul Christopher, head global market strategist for Wells Fargo Investment Institute, said: "Investors should get accustomed to uncertainty because of US foreign policy questions and trade questions.
"The market will see good days and bad days and end the year roughly where it is."
The hardest word
From falling as much as 4%, shares in United Airline's parent company United Continental Holdings are now down 1.5% after chief executive Oscar Munoz's second attempt at an apology.
As Wall Street heads towards the closing bell, here is what the company's shares have done today.
United share fall narrows on apology
That seems to have done the trick.
Shares in United Airlines-owner United Continental Holdings are regaining a little ground after chief executive Oscar Munoz issued another statement, this time "deeply" apologising to the customer who was forcibly removed from a flight.
Mr Munoz said in his second statement: "It's never too late to do the right thing."
Its shares are now down 2% at $70.05.
BreakingUnited boss: 'we take full responsibility'
United Airlines chief executive Oscar Munoz has issued another statement after a 69 year-old passenger was violently removed from one of its flights on Sunday.
This time, Mr Munoz says:
Bombardier ticks higher on train talk
Bombardier and Siemens are both keeping schtum on talk of a tie-up between their train operations but investors are excited.
Shares in Canada's Bombardier are currently 4.5% higher at C$2.32.
Investors believe United will weather the storm
Wall Street thinks United Airlines will survive the public relations crisis the business finds itself in.
Shares in its parent company, United Continental Holdings, are currently down 3% at $69.33.
Craig Hodges, portfolio manager at Hodges Capital, said: "The company has a very black eye, and they need to do some PR work, but I don't think it will have any effect on the fundamentals."
United footage 'troubling', says Spicer
White House press secretary Sean Spicer says of the videos showing a United Airlines passenger being dragged out of his seat:
"It was an unfortunate incident, clearly when you watch the video it is troubling to see how that was handled.
"I don't think anyone looks at that video and isn't a little disturbed that another human being is treated that way.
He's "sure" that President Trump has seen the video - but doesn't want to make a statement that might prejudice the reviews being carried out by United and the Chicago police.
To boldly go...
Rail deal could create buffer against China rival
There are now more reports emerging that Siemens and Bombardier are in discussions about combining their rail businesses.
Reuters is reporting the talks and says a joint venture between the German and Canadian companies could give them strength against Chinese rival CRRC Corp.
There has been speculation in the past that Siemens and Bombardier have attempted to combine their rail operations, though this was denied by the Canadian firm.
Bombardier employs 3,500 people in the UK and among its customers has produced trains for London Underground.
Listen: where now for United Airlines
United Airlines shares regain ground
Shares in United Airlines-owner United Continental Holdings have clawed back a bit of ground and are now down 2.7% at $69.59.
US tax reform will not be 'easy'
Stephen Schwarzman, the chair of Donald Trump's Strategic and Policy Forum, is taking a cautious stance on tax reform.
Mr Schwarzman, who is also chairman and chief executive of private equity giant Blackstone, told FOX Business Network: "It’s a complicated area because to lower rates you have to raise revenue from areas and there are a lot of sacred cows that people don’t like to have taken away, whether they are mortgage deductions or charity deductions or deductibility of state and local taxes.
"And so, threading the needle on say a program that works on the numbers but also works politically is not particularly easy.”
Word of the day: volunteer
US dictionary publisher Merriam Webster has offered some help to United Airlines
Apple rumours hit Dialog
Is Dialog Semiconductor about to suffer the same fate as UK chip designer Imagination Technologies?
German bank Bankhaus Lampe has reduced its rating on Dialog's shares from "hold" to "sell" because it reckons that Apple, which accounts for a major slice of its revenue, is developing its own chip for the iPhone.
It is feared Apple's own battery-saving chip could replace Dialog's power management integrated circuits as early as 2019.
Its shares fell by 14.3% but Dialog said it saw no reason for the fall and remain comfortable with its financial outlook for "good revenue growth" in 2017.
Mining stocks rise on flight to safety
Investors' rush to find a safe haven in gold helped send shares in precious metal miners to the top of the FTSE 100 on Tuesday.
Randgold Resources was the day's biggest riser, with its shares closing 4.63% higher at £75.65. It was followed by Fresnillo, whose shares rose 3.92% to £16.52.
Gold rose 1% to $1,266.96 an ounce.
The FTSE 100 closed up 23.18 points at 7,372.12.
The FTSE 250 ended Tuesday up 41.92 points at 19,306.52, led by JD Sports which reported record profits, sending its shares 8.24% to 440.10p.
AI wins $290,000 in poker tournament
Trump tantalises with talk of trade 'surprises'
Donald Trump has promised the chief executives of US businesses some "very pleasant surprises" on the North American Free Trade Agreement or Nafta. However, he declined to say what the surprises are.
The US President also reiterated a promise to "reduce taxes". His Treasury Secretary Steven Mnuchin promised "very significant" tax reform before the Congressional break in August.
United brand damage
The chief executive of pollsters Ipsos Mori tweets after shares in United Airlines' owner fall 4%, wiping more than $700m off its market value...