There could be refinement in these but for now here are my initial thoughts on a premise and a logline.
To those heavily burdened by rules and constraints, the promise of freedom is alluring and a goal they would do anything to get. But there is always something tugging them back.
Trapped on an airplane with an owner who mistreats him, a marionette sees freedom in a simple balloon and endeavors to catch it in order to embrace the freedom it promises. All the while he must battle with the strings of control that deny him freedom.