Airlines and hoteliers say Heathrow's funding model should be reformed before any investment is made in the proposed third runway.
Businesses want a fundamental review of the regulations set by the Civil Aviation Authority (CAA) that govern what Heathrow can charge. They say the current model makes Heathrow the most expensive airport in the world.
If changes are not made, businesses say the third runway will not happen as it will be too expensive.
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