Tens of thousands of visitors will flock to the five-day show, held southwest of London, as weather forecasters warn of scorching record temperatures in the United Kingdom.

"It's going to be the hottest Farnborough ever, so if you are going there, take plenty of water, take a hat — and don't be surprised if you see either very sweaty people or people in shorts," said analyst Richard Evans at air transport data specialist Ascend by Cirium.

The UK’s Met Office has issued a historic red warning for extreme heat, with southern England temperatures potentially exceeding 40 degrees Celsius on Monday or Tuesday for the first time.

Organizers insist the show must go on "as planned" and will provide water refill points, shaded areas and air conditioning throughout exhibition halls.

This year's event, one of the largest civilian and defense shows, is the first global aviation get-together since the COVID-19 pandemic hit.

"This is the first major global airshow for three years since Paris 2019," Farnborough chief executive Gareth Rogers told AFP.

The biennial Farnborough show was canceled in 2020 as the COVID-19 health crisis grounded aircraft and ravaged the sector.

Global air traffic is gradually recovering and in May reached more than two-thirds of its pre-pandemic level, according to estimates from the International Air Transport Association (IATA).

That recovery has however faced headwinds from rocketing inflation fueled by historically high energy prices and higher wages, while staff shortages constrain airports and spark flight cancellations.

At Farnborough, United States titan Boeing and its European archrival Airbus will battle for supremacy as they declare their latest multi-billion-dollar jet orders.

The show will this year zero in also on green themes of decarbonization and sustainability, as many carriers seek to replace ageing fleets with modern fuel-efficient aircraft that emit less carbon dioxide.

Farnborough visitors will be thrilled by air displays by Royal Air Force’ Red Arrows and South Korean Air Force’ Black Eagles, as well as the US-made F-35 Lightning II stealth fighter.

Airbus and Boeing will also showcase their latest twin-aisle passenger aircraft, the A350-900 and the 777X, respectively.

Meanwhile, Russia's war on Ukraine has sparked an upsurge in defense spending as nations seek to bolster armed forces.

"Anecdotally we are certainly seeing a greater interest in the defense element of the show," said Rogers.

Defense agreements are however not announced at Farnborough, unlike commercial civil aviation deals.

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