Where would a third runway go at Heathrow?

Related questions

1. Does Heathrow Express go to Terminal 3?
2. Can I use Oyster card for Heathrow Express?
3. What to do if you have an overnight layover?
4. Can I stay in Heathrow airport overnight?
5. What time do I need to be at the airport Heathrow?
6. What airlines fly from Terminal 3 Heathrow?
7. How long before a flight can you check a bag?
8. What happened to Terminal 1 at Heathrow?
9. Is it cheaper to buy Heathrow Express tickets online?
10. How long before flight can I check in?

Tags

1. #existing
2. #third
3. #extending
4. #heathrow
5. #runway
6. #north
7. #option