[resolutebat]

Not if they're banned, which will almost certainly be the case by the time Boom is commercially available.

[willmadden]

We're banning engines now?

[mlyle]

Airlines are almost certain to face significant carbon regulation or carbon taxes in the next couple of decades. In turn, lots of engines will be effectively banned.

Of course, this is nothing new: noise abatement effectively banned a whole lot of engines, too.

[pmontra]

We do that with the most polluting car engines.