HHS (Heiko Schulz) started this model originally in 2006, based on the Bocian by AJ MacLeod. 
It received a major update in 2016 by D-ABBA (Thomas Polzer), Viktor Radnai, D-ECHO (Benedikt Wolf) and gsagostinho (Gilberto Agostinho), using parts from the ASK13 by Patrice Poly. 
From this time on it is under active development (see github.com/viktorradnai/flightgear-ask21.git for the development version).

Passenger view based on dual control code by Anders Gidenstam
The aircraft is licensed under the GPL license version 2 or later.
