flightgear-data-base software package provides FlightGear Flight Simulator -- base files, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install flightgear-data-base
flightgear-data-base is installed in your system.
Make ensure the flightgear-data-base package were installed using the commands given below,
$ sudo dpkg-query -l | grep flightgear-data-base *
You will get with flightgear-data-base package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Games |
| Package | flightgear-data-base |
| Version | 1:2016.3.1+dfsg-1 |
| Description | FlightGear Flight Simulator -- base files |
| Sub Section | Games |