Hounslow Heath Aerodrome

It was in the London borough of Hounslow, and hosted the British Empire's first scheduled daily international commercial flights, in 1919.

Nine years before for the first precision mapmaking and surveying it saw General Roy's Baseline measured from one end of the heath to the other.

The act marked a key stage in the Principal Triangulation of Great Britain and was repeated with greater precision on later occasions.

The departure points were defined as either Hounslow Heath Aerodrome (for landplanes) or RNAS Calshot, near Southampton (for seaplanes and flying boats).

Hounslow Heath has largely reverted to an undeveloped public open space and nature reserve.

Hounslow Heath Aerodrome 1918 overlaid on 2011 roads
"Map of Air Routes and Landing Places in Great Britain, as temporarily arranged by the Air Ministry for civilian flying", published in 1919, showing Hounslow as the hub of the network.