Heathrow’s plan to build a third runway will “inevitably” lead to higher air fares for passengers, aviation experts have told The i Paper .

The airport’s owners submitted their £49bn expansion plan to the Government this week, including a scheme to build over a section of the M25, which will be rerouted.

Labour Chancellor Rachel Reeves , who wants a third runway up and running by 2035, said on Friday that increased capacity was “essential” to Britain’s economic growth.

However, some airlines – despite backing a third runway – have expressed fears that Heathrow will raise its landing charges to pay for the huge construction project.

British Airways (BA) warned that higher landing charges could bring the total fees faced by long-haul passengers to £100 per flight.

Heathrow has d

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