The Airport Groupings that have been pre-created for all customers were set up based on the IATA Metro Code values each airport is assigned to, along with our industry knowledge.
When an airport obtains an IATA code for itself it will also be assigned an IATA Metro code. These Metro Codes are used to group several airports into a service area. For example, IATA has placed BUR,LAX,LGB,ONT & SNA in the LAX Metro Group.
The predefined groupings use the IATA metro code followed by an astrick. For example the LAX metro group is designated as LAX*.
To see a complete listing of the predefined Airport Groupings or to create your own Airport Grouping use the User>Settings>Airport Groupings & Metro Codes page.