XD-DENG edited a comment on issue #4747: [AIRFLOW-3933] Fix various typos URL: https://github.com/apache/airflow/pull/4747#issuecomment-465920636 Hi @zhongjiajie , Yes it is free for open source projects, but for relatively small size ones. If you integrate your Airflow fork with TravisCI, it's free but you can only run 5 tests concurrently. ASF is using a subscribed version so Apache projects like Airflow's CI on Travis can run "unlimited" concurrent tests. It's not free in that case.
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