[shhrubbery!]

It would be nice if airlines could offer 'child-free' and 'non-child-free' flights.

I don't know if that would be a commercially viable idea, but I'm sure there are many passengers who would be interested in one or the other option.

But good idea or not, the ACLU would probably barge in and prevent the airlines from even trying it.

[r9etb]

I don't know if that would be a commercially viable idea

It could, in some markets ... Florida vacation spots being an obvious example.