FGAddon license provenance

Official FlightGear policy, checked 2026-11-04:
https://www.flightgear.org/about/policy/

The policy states: "Aircraft released under the GPL2+ may be hosted on the fgaddon repository".
F-14B, F-15, and Mirage 2000 were obtained from the official FGAddon aircraft distribution. The archive hashes and snapshot dates are recorded in the source manifests.

F14's supplied README names Richard Harrison and contributors, but the distributed snapshot has no standalone COPYING file. Its attribution license text is an accompanying copy of GPL version 2, identified here as distributor-provided, not an invented upstream file. Original author notices and the official archive are preserved.
