The Civil Aviation Authority has said that it has concerns over the Heathrow third runway.
In a letter to the Department for Transport, the Civil Aviation Authority said that questions over the cost and schedule of the new runway must be answered “urgently and decisively”.
“These concerns have not yet been adequately addressed despite repeated requests from the airline community and the CAA,” read the letter.
In response to the letter, Heathrow has said plans for the new runway are running smoothly and it is on track to be completed by 2026.
“We continue to engage with all of our stakeholders on our expansion plans and look forward to presenting a detailed preferred masterplan for further public consultation next year,” said a spokesperson.
“We remain on track to submit a planning application in 2020 and for the new runway to open in 2026.”
The Civil Aviation Authority (CAA) is monitoring “how well Heathrow Airport Limited (HAL) is engaging” with interested parties over the controversial expansion.
Airlines have been concerned about the lack of information.
British Airways, the biggest airline at the airport, said in a statement: “Heathrow is the most expensive hub airport in the world. It’s outrageous that it has yet to provide a detailed breakdown of the £14 billion expansion costs.
“The CAA is right to demand this as the regulator needs to ensure that passenger charges don’t rise from current levels and the UK benefits from cost effective infrastructure so that it can compete on a global scale post Brexit.”