> Second, if it were passed, intent can be very hard to prove -- even in seemingly clear-cut cases.

It's not at all clear cut in my opinion. This is information that is already in a public database, and it's the location of an airplane - not a person. That's not a technicality, unless the airplane is somehow a primary residence.

It's pretty different than publishing someone's private phone number or the name of the school that their children attend. The latter type of information is actually private.