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11
votes
5answers
4k views

Is starting a jet engine without ground support possible?

We have had more... than... one question about jet aircraft taxiing about the airport without their jet engines running. Those address several issues such as cost vs savings and regulatory approval. ...
8
votes
1answer
3k views

Why do I hear the “real” engine noise only when the plane is on the runway?

I understand that (from other answers) planes taxi using engines only. But, when I'm a passenger, then why do I hear the "real" engine noise only when the plane is on the runway? So, if planes taxi ...