Template:Feature Freeze Announcement
On the 17th of June, the FlightGear development stream will be declared frozen. This means that, from that date onwards, no new features or major changes shall be pushed onto the development streams (neither source nor data). This period is for preparing the code for the upcoming 3.6 release (August 17) and make sure there are no major issues. It lasts for four weeks until creation of the release branches (July 17).
It is a good idea for aircraft developers to adhere to this rule. However, aircraft in FGAddon may be handled as an exception from the frozen state. Also, aircraft defined as part of the base package (the c172p and ufo) enter the frozen state and shall not undergo major changes in that period.
See our Release plan for more details on the procedures leading to a release.