CPDLC Centers - geometry licences

US/KZWY/KZAK/PAZN/Canada (ex Gander)/several Pacific FIRs: FAA AIS Open Data, US Government work (public domain).
All other FIR/UIR shapes: drawn by My Aircraft Management from published State AIP ENR 2.1 and ICAO
regional air navigation plan coordinates (facts; see SOURCES.md for the per-shape citation).
Land-border segments defined as 'along the national border': Natural Earth (public domain).
No EUROCONTROL data is used.
