Data Descriptions

For a description of the terms used in our database.

Country Abbreviation

Every country in the world has a 2-letter abbreviation code (ISO 3166) which is defined by ISO (International Organisation for Standardization).

http://www.iso.org/iso/country_codes.htm

World Area Codes (WAC)

Numeric codes used to identify geopolitical areas such as countries, states, provinces, and territories or possessions of certain countries. The codes are used within the various data banks maintained by the Office of Airline Information (OAI) and are created by OAI.

http://www.transtats.bts.gov/Fields.asp?Table_ID=315

(IATA) Airport Codes

These airport codes are another standard which is updated and designated by the International Air Transport Association (IATA).

http://www.iata.org/index.htm

GMT Offset

The Greenwich Meridian (Prime Meridian or Longitude Zero degrees) marks the starting point of every time zone in the World. GMT is Greenwich Mean (or Meridian) Time. It is the mean (average) time that the earth takes to rotate from noon-to-noon. GMT is fixed all year and does not switch to daylight savings time. GMT is World Time and the basis of every world time zone, which sets the time of day and is at the centre of the time zone map. GMT sets current time or official time around the globe. Most time changes are measured by GMT. Although replaced by atomic time (UTC), GMT is still widely regarded as the correct time for every international time zone.

http://greenwichmeantime.com/

Runway Lengths

The length of the longest runway measured in feet. Important note for pilots: We cannot be held responsible for the accuracy of the runway lengths.

Runway Elevation

The elevation in feet measured from Mean Sea Level (MSL). Used to calculate the air density for takeoff and landing. The less dense the air, the more speed (or less weight) you need for takeoff, to create enough lift.

Latitude and Longitude data

Measured in GPS (Global Positioning System) data values. GPS is a system that was developed by the US Armed Forces for positioning and time purposes. On a map, the globe is divided into rectangles, like you probably have seen in an atlas or on a map. Because our planet is nearly spherical, the lines makes it possible to determine any point on the surface of the earth, and describe it in degrees, minutes and seconds.