PARIS (Reuters) -Lockheed Martin and Boeing said on Monday they are positioning themselves to secure a significant share of U.S. President Donald Trump's Golden Dome missile defense system, as competition intensifies over what could become one of the world's largest defense contracts.

Boeing executives have underlined the increasingly challenging geopolitical picture facing customers for the company's defence products.

Boeing Co. said it’s made more progress in the past four to five months on the long-delayed new presidential aircraft than at any point in the last four years as it identifies ways to streamline the complex program.

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Geopolitical tensions roiled the opening of the Paris Air Show on Monday as French authorities sealed off Israeli weapons industry booths amid the conflicts in Iran and Gaza, a move that Israel condemned as "outrageous.

The global commercial aviation fleet will stand just under 50,000 planes in 2044, with most built over the next 20 years, according to a Boeing forecast released Saturday.