Ran across this while looking for Tower addons:
[
www.msimulation.de]
"For the reality of a flightsimulation it is important, that real air-traffic exists. Thatsīs why we made it to our goal, to connect the tower simulation from BAO(1995), to FlightGear.
"Of course we will add more airports to the tower simulation from BAO.
But at building the first airport, we got some problems with the 3D models (.dbt), that looks like that BAO did these files without any standard.
"Anyhow, also this problem we will solve, and soon we will by connected to tower, lift up to one more test-flight."
[
www.flightgear.org]
"FlightGear is an open-source, multi-platform flight simulator."
Looked interesting, thought I'd share...
-Dan