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Story summary
- Heathrow Airport warned its third runway could be delayed four years due to planning issues.
- The runway is estimated at £49bn and was originally expected to open by 2035.
- Heathrow aims to secure planning permission by 2029 and open the runway within ten years.
- Expansion could create about 100,000 jobs and raise annual flights to 720,000.
- London Mayor Sadiq Khan opposes the project, citing noise and climate impacts.