The following values are predefined:

• 'D' - Domestic, both departure and arrival airport is in the same country,
• 'I' - International, neither domestic nor Schengen. (Non-Schengen.)
• 'S' - Schengen", both departure and arrival airport is in the Schengen area, but not domestic.

Other system specific values are allowed.

NB! What is considered domestic and international will vary between airports in different areas. The DIIndicator is a relative indication and not absolute.

See also:

• https://airm.aero/developers/advanced-search/1.1.0/CodeInternationalFlightType?model=LogicalModel
• https://airm.aero/developers/advanced-search/1.2.0/CodeFlightOriginType?model=LogicalModel