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There's also no law against me belting out some opera classics on the plane while my 6 year old accompanies me on the violin I got them for christmas.

But the pleasure it brings the two of us might be outweighed by the displeasure of the other 500 people on the plane.

There aren't specific laws about this, but the law does allow for private businesses, and even public services to set rules around behavior.

There likely is a rule about being disruptive on a bus (or airplane), and it is within the law to enforce those rules.

Acela does have the quiet car.

Many more people do sleep on planes than busses.

And a business can decide they no longer wish to serve a specific customer.