It's located at Hillingdon, London in the United Kingdom. It has carried 69,433, 230 passengers, and it's indeed the busiest airport you can find in the United Kingdom. Its site is 12.14 square kilometers, while its land is 12 nmi which is equivalent to 22 km, 14mi. It was just a small airfield when it began in 1929, and its name was derived from Heart Row or Heartrow which was a local hamlet during that time that had orchards, and market gardens. Today, this small airline serves about 90 airlines and could fly up to 170 destinations in the world. It has 6 terminals including cargo terminal.