It turns out that it's probably beef fat.

'Fly less' is the obvious answer, but there are some effective interim solutions, too.

United fleet and passenger service workers are suing the airline over a planned cut to their hours, saying it violates their contract and the law providing billions in coronavirus aid from the government.

United is walking back some worker schedule cuts, making them voluntary, after a lawsuit from the employees' union

Airlines want the government to loosen the amount of air service they're required to provide as the number of passengers on board hits the lowest since the 1950s.

The travel landscape continues to evolve during the coronavirus pandemic. CNBC's Phil LeBeau reports the details about temperature checks for airline passengers.

Before boarding, passengers and crew members will have their temperatures checked at the gate. If someone registers a temperature of 100.4 or higher, they will be kept at the gate.

Covid-19 has infected more than 3.8 million people around the world as of Friday, killing at least 269,881 people.

Three Senate Democrats are urging Treasury Secretary Steven Mnuchin to crack down on airlines that are cutting employee hours, despite billions in federal coronavirus relief.

Cramer said that he viewed Buffett bailing on airlines as a sign that there were serious issues in the broader economy.

"I don't think you're buying these thinking that that business is coming back immediately," TD Ameritrade chief market strategist JJ Kinahan told CNBC.

"I recommend selling" some position in the S&P 500 index fund "if the [upward] streak continues," the "Mad Money" host said.

The last few weeks have seen many unusual flows into exchange-traded funds that offer an insight into the market recovery.

Buffett said Berkshire sold its entire stake in United, American, Southwest and Delta Airlines, worth more than $4 billion on December 31.

Warren Buffett has again ditched the airline sector as coronavirus threatens to be a challenge too big for him to stomach.

Berkshire Hathaway's 2020 annual shareholder meeting, the "Woodstock for Capitalists," was hosted virtually for the first time ever.

Airline shares were headed for another day of sharp declines, this time after Warren Buffett said Berkshire Hathaway's cashed out of its stakes in the four largest carriers.

As airline stocks tumble, investors in the U.S. Global Jets ETF (JETS) seem to betting on a further bailout for the group, says market researcher Dave Nadig.

Warren Buffett has exited the airlines, but one trader says there could be pockets of opportunity elsewhere in the travel space.

Egyptian billionaire Naguib Sawiris said he would buy airlines, going against fellow billionaire investor Warren Buffett, who announced that Berkshire Hathaway sold all airline stocks at the firm's annual meeting on Saturday.

CNBC's Phil LeBeau reports on United Airlines bond offering. With CNBC's Melissa Lee and the Options Action traders, Carter Worth, Mike Khouw and Tony Zhang.

United Airlines had reported a first-quarter pretax loss earlier this month.

Torbjorn Wist, CFO of SAS, discusses the airline's position in the coronavirus crisis and its seeking of state aid to support the company through the pandemic.

A number of European airlines have dropped their financial guidance for the year, as the ongoing coronavirus pandemic creates widespread uncertainty about when business will return to normal.

These are the stocks posting the largest moves in midday trading.

Check out the companies making headlines after the bell.

Permanently blocking middle seats and limiting the number of passengers per flight is a costly move for airlines and would increase ticket prices.

On March 23, 2020, the Turkish Government published a resolution in the official gazette to temporarily reduce the rate of VAT on air passenger transport to one percent.

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Government to inject equity into state-owned carrier in latest intervention in aviation sector

Investors demanded too high a price to lend to US carrier reeling from coronavirus shutdown

Post-Brexit Britain will need a viable industry to support global role

Incoming CEO tells investors and carrier’s 96,000 staff that he will not duck hard decisions

EXCLUSIVE: Etihad has a large cargo operation, but has been forced to repurpose 22 of its passenger planes as freighters during the coronavirus pandemic, including the Man City jet.

Premier League clubs could be hit with a financial crisis similar to those faced by airlines across the world if football doesn't return by August, Crystal Palace chief Steve Parish has claimed.

Certain airlines including Emirates, Etihad, American Airlines and Qatar Airways will be broadcasting England's World Cup quarter final live on Saturday afternoon.

Singapore Airlines is one of the most lauded carriers in the world, with more awards than you can shake a designer amenity kit at. But the scores from these experts are far from perfect...

Air New Zealand has been named as the world's best airline for 2020. The accolade was bestowed upon it for a sixth time by the Airline Excellence Awards, run by AirlineRatings.com.

The Singapore-based budget carrier has launched its 'Silly Season Sale' to mark the start of 2020 with international flights from Australia from as little as $135

Singapore Airlines was entrusted with carrying St Therese of Lisieux's forearm and that of her parents Saints Louis and Zélie Martin, from France to Sydney this week.

Chloe Haines, 25, has been hit with a bill for £85,000 by Jet2 over her 'extremely disruptive behaviour' on a flight from Stansted to Turkey when she allegedly tried to 'storm the cockpit'.

Manodh Marks, the first person in Australia to be jailed for attempting to take control of an aircraft, could now be released from prison in two-and-a-half years.

Budget airline AirAsia must have missed the memo about the popularity of airline food, announcing the opening of a new restaurant serving only in-flight meals.

Travellers were boarding a Malaysia Airlines flight on New Year's Day from Kuala Lumpur to Auckland when their journey came to a sudden halt.

Flight MH145 from Kuala Lumpur to Auckland was cancelled about 8.45pm on New Year's Day after passengers sat in the plane on the tarmac for hours.

Ina Meliesa Hassim was fired from her position with Malaysia Airlines in 2017 for being just one pound 'overweight'. The Industrial Court of Malaysia ruled in favour of the airline.

The Malaysian flag carrier scooped a total of three accolades at the annual Cellar in the Sky Awards in London, which included the coveted title of having the best overall wine cellar for 2019.

DEREK LAWRENSON IN ANTALYA: Around about the time he was due to complete his third round in the Turkish Airlines Open on Saturday, Eddie Pepperell was back at his hotel.