David's rehabilitation idea

Yes, the movie is based on real facts. There's the operation migration, these guys are doing it in reallife:

http://www.operationmigration.org/

Is that something that's been tried? Training endangered birds to migrate?

Fly Away Home dramatizes the actual experiences of Bill Lishman who, in 1986, started training geese to follow his ultralight and succeeded in leading their migration in 1993.