Refer to https://github.com/apache/airflow/blob/master/docs/project.rst

Committers are listed in a few additional places as well (Some of these may only be visible to existing committers):

Committers are community members that have write access to the project’s repositories, i.e., they can modify the code, documentation, and website by themselves and also accept other contributions. There is no strict protocol for becoming a committer. Candidates for new committers are typically people that are active contributors and community members.

Becoming a Committer: