added Copyright

THIRD-PARTY-NOTICES.txt

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+THIRD-PARTY NOTICES
+======================
+
+This product bundles or derives data from the following third-party sources.
+
+1) OurAirports (Public Domain)
+   Site: https://ourairports.com/
+   Repo: https://github.com/davidmegginson/ourairports-data
+   License: Unlicense (Public Domain dedication).
+   Notes: OurAirports data is generated daily. The primary CSV used for airport lookups is
+          `airports.csv`, which includes columns such as ident, gps_code, name, municipality,
+          iso_country, and iata_code.
+   Required attribution: None required (public domain), but attribution is appreciated.
+   Recommended citation: “Contains data from OurAirports (ourairports.com).”
+
+2) OpenFlights (ODbL 1.0)
+   Site: https://openflights.org/
+   Data: https://github.com/jpatokal/openflights/tree/master/data
+   License: Open Database License (ODbL) v1.0 (https://opendatacommons.org/licenses/odbl/1.0/).
+           Any rights in individual contents of the database are licensed under the
+           Database Contents License (DbCL) v1.0.
+   Files used: airlines.dat (airline ICAO/IATA/name/callsign/country/active),
+               planes.dat   (aircraft ICAO/IATA/name).
+   Share-alike note: If you publicly share a modified/derived **database** based on OpenFlights,
+                     you must distribute that database under ODbL 1.0 and keep OpenFlights attribution.
+                     (This obligation applies to the data, not to your application’s source code.)
+
+Practical guidance
+------------------
+• Airports: Prefer OurAirports for airport → city/name mappings (public domain).
+• Airlines & Aircraft types: Use OpenFlights (ODbL) for ICAO → human name mappings.
+• If you publish your merged/pruned JSONs, include:
+    - This THIRD-PARTY-NOTICES.txt
+    - The full text of the ODbL 1.0 (recommended as LICENSE-ODbL-1.0.txt)
+    - A short note in your README acknowledging both sources.