Washington (PTI): US President Biden and his predecessor Donald Trump have clinched their parties' presidential nomination, setting the stage for a 2020 rematch during the November elections.

Biden, 81, won the Democratic presumptive nomination on Tuesday after easily clinching the presidential primaries in Georgia, as the number of delegates in his kitty crossed the halfway mark of 3,933 pledged delegates. A total of 1,968 delegates were required to win the Democratic nomination.

He would formally be declared the party's nomination during the Democratic National Convention in Chicago in August.

Trump, 77, reached the 1,215 delegates necessary with an allocation of delegates from Washington state.

Trump will be officially nominated at the Republican National Convention in Milwaukee this July.

He will lead the Republican Party in a third consecutive presidential election after clinching the nomination Tuesday.

Their rematch, long anticipated, but hardly clamoured for, is broadly expected to mirror the 2020 campaign, though Trump will run this time under the spectre of 91 felony charges.

Trump is scheduled to become the first former American president to go on trial in a criminal case on March 25 in New York, where he faces charges he falsified business records to hide hush money payments to a porn star.

It would be the first presidential rematch since 1956.

The last presidential rematch came in 1956 when Republican President Dwight D Eisenhower again defeated Adlai Stevenson, the Democratic opponent he had four years prior.

Biden defeated Trump in the 2020 November elections, an outcome still challenged by the Republican leader.

Biden has faced only nominal opposition to become the Democratic nominee.

Trump has defeated several Republicans in primary elections, including Indian-origin former UN Ambassador Nikki Haley and Florida Governor Ron DeSantis. Other candidates, including Trump's former vice president, Mike Pence, dropped out months ago for lack of voter support.

Biden said he is honoured to become his party's presumptive nominee and warned of another Trump presidency.

"I am honoured that the broad coalition of voters representing the rich diversity of the Democratic Party across the country have put their faith in me once again to lead our party and our country in a moment when the threat Trump poses is greater than ever," Biden said in a statement after he bagged majority of the delegates.

"Voters now have a choice to make about the future of this country. Are we going to stand up and defend our democracy or let others tear it down? Will we restore the right to choose and protect our freedoms or let extremists take them away? Will we finally make the wealthy pay their fair share in taxes or will we allow corporate greed to run rampant on the backs of the middle class?" he said.

Vice President Kamala Harris celebrated Biden securing the delegates needed to clinch his party's nomination on Tuesday and forecast how the president's campaign will look to take the fight to Donald Trump in the general election.

"From the start, the President and I never took this re-nomination process for granted. We have campaigned in earnest because we know doing so is an important step towards earning reelection and will help us mobilise the voters we need in November," Vice President Kamala Harris said in a statement.

"Now, the general election truly begins, and the contrast could not be clearer. Donald Trump is a threat to our democracy and our fundamental freedoms," she said.

With his State of the Union speech last week, Biden passionately presented our alternative vision, she said. "We will reduce costs for families, make housing more affordable, and raise the minimum wage," she added.

"We will restore Roe (nationwide right to abortion), protect voting rights, and finally address our gun violence epidemic. The American people overwhelmingly support this agenda over Donald Trump's extreme ideas, and that will propel our campaign in the months ahead," Harris said.

Democratic National Convention (DNC) Chair Jaime Harrison said this year's election will decide the future of democracy.

"Donald Trump is running a campaign focused on revenge, retribution, and his own self-interest. President Biden is running a campaign focused on what makes our country so great: the American people. President Biden understands that our freedoms, our democracy, and the very future of our country are at stake and once again, he will meet this moment and bring Democrats together this November," he said.

"America spoke, and today Joe Biden has become the presumptive Democratic nominee for President of the United States. We have arrived at this moment because millions of Americans made their voices heard, choosing Joe Biden's vision of freedom and progress for all Americans," said Democratic National Convention Committee Chair Minyon Moore.

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Tehran (AP): Jet fuel prices are rising as the war in the Middle East disrupts global oil supplies, putting cost pressure on airlines as the busy summer travel season approaches.

Experts say it's not a question of if airfares will go up, but when, for how long and by how much. The impact may be felt most on long-haul international routes, which burn significantly more fuel than shorter flights.

Some airlines outside of the US have announced fare increases or fuel surcharges in an effort to offset the growing expense. In the US, United Airlines CEO Scott Kirby recently warned that airfare increases will “probably start quick" as increasing fuel costs work their way through the industry.

Why are jet fuel prices rising?

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The war is constraining oil exports and prompting major producers like Kuwait, Saudi Arabia and Iraq to scale back output as shipments face growing obstacles.

Iran has attacked commercial ships across the Persian Gulf and targeted oil infrastructure in Gulf Arab nations following US and Israeli strikes. The attacks have effectively halted traffic through the Strait of Hormuz, a narrow passage that carries about one-fifth of the world's oil supply.

The volatile crude oil prices causing retail gasoline prices to swing up sharply have had the same effect on the price of jet fuel. The average price in the US reached $3.99 per gallon on Friday, up from $2.50 the day before the war started two weeks ago, according to the Argus US Jet Fuel Index. The index tracks the average price airlines pay for jet fuel across major US airports.

Figures from the US Department of Transportation's Bureau of Transportation Statistics show that US airlines paid about $2.36 per gallon for fuel in January, the most recent data available. 

What does it mean for airlines?

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Some airlines are partially protected from sudden price spikes through fuel hedging, a strategy that allows them to lock in fuel prices months or even years in advance. But not all airlines hedge, and those that do are usually only protected for a portion of their fuel needs, meaning prolonged price surges may cause more carriers to raise fares.

“No one hedges anymore, and even if you do, hedging the crack spread is really hard to do,” Kirby said at a Harvard event last week. The crack spread is the difference between the price of crude oil and the price of products produced from it, like gasoline.

Another factor for airlines: Air space closures have required rerouting flights around parts of the Middle East, which can mean longer routes, additional fuel burn and higher operating costs.

What does it mean for travelers?

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Travelers may feel the impact in several ways.

Airlines can add or increase fuel surcharges, an extra fee common among carriers outside of the US that's added on top of the base ticket price.

Major US carriers, however, don't charge a separate fuel surcharge. Instead, they build fuel costs into the overall ticket price, meaning any increase is more likely to show up as a higher base fare for travelers, according to Tyler Hosford, security director at global risk management firm International SOS.

Airlines also may adjust what they charge for premium add-ons — such as seat upgrades, extra legroom seats, checked bags or priority boarding — as another way to offset higher operating costs. For consumers, that means even if the base fare doesn't rise immediately, the total cost of a trip could still increase once additional fees and upgrades are factored in.

If higher fuel prices persist, airlines may also adjust schedules or reduce certain routes, said Christopher Anderson, a professor at Cornell University's business school whose research includes operations and information management in the hospitality and airline industries. 

How high could airfares climb?

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It's difficult to predict exactly how much ticket prices could increase as a result of costlier oil and fuel. Industry analysts say the impact of higher jet fuel costs can vary based on the route, airline and travel demand.

Fuel typically accounts for 20% to 25% of an airline's operating costs, making it the second-largest expense after labor, according to Rob Britton, an adjunct marketing professor at Georgetown University and retired American Airlines executive. A sharp rise in fuel prices therefore can have a major impact on airlines' budgets. 

Which airlines have announced price hikes?

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So far, most fare increases and fuel surcharges are coming from airlines based in the Asia-Pacific region, but experts expect more airlines — especially those without fuel hedging — to follow if high jet fuel prices persist.

Hong Kong's flag carrier, Cathay Pacific, said it would increase its fuel surcharge starting Wednesday.

“The price of jet fuel has approximately doubled since March amid the latest developments in the Middle East,” the airline said in a statement Thursday.

Other airlines with price increases or new surcharges include:

— Air France-KLM said roundtrip economy fares on long-haul flights could rise by about 50 euros (about $57).

— Air India introduced fuel surcharges Thursday on certain routes. After March 18, the carrier says the surcharge will increase by up to $50 for all tickets to Europe, North America and Australia.

— Hong Kong Airlines increased fuel surcharges across several routes as of Thursday.

— FlySafair in South Africa announced a temporary fuel surcharge 

What can travelers do to keep costs down?

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Experts say travelers planning summer trips may be able to limit the impact of rising airfares by booking earlier rather than waiting for last-minute deals.

Locking in ticket prices sooner — especially with flexible booking options that allow changes — can help secure lower prices before airlines adjust rates further.

Hosford, the security director at International SOS, suggests travelers stay flexible with travel dates, check fares at nearby airports and set alerts for price drops. He also recommends using frequent flyer miles or credit card points to book flights instead of holding out for a “perfect deal.”

“If you were going to spend cash on the flight but now you're not, then that's a good redemption deal," he said.