Rachel Reeves’s bid to expand Heathrow airport could add £40 to the cost of an airline ticket, according to the Treasury’s own analysis. The chancellor’s proposal to minimise the carbon emissions of a bigger Heathrow include the use of sustainable aviation fuels, which experts say are expensive and unlikely to reach the scale needed for aviation expansion. A Treasury cost-benefit analysis seen by the Guardian shows that sustainable fuels could increase the cost of a single economy airline fare by £37.80 by 2040. There are no plans to ensure frequent flyers, or those in first or business class, shoulder more