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, you will find that 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. I got to know this from Ash earlier: https://github.com/apache/airflow/pull/3967#issuecomment-425369893 (both "[ci skip]" and "[skip ci]" would work I remember)
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