The physical characteristics are not presented to you when booking your flight.

By the time you've arrived at the airport and see the MAX at your gate, it's too late and you've already paid your fare.

You can DDG specifications of your plane by model number and nay, they have to be unique per revision.

I'm choosing

1. to make certain I don't board one of these machines by mistake. I will not risk my life over this egregious comedy.

2. to vote with my dollars and punish Boeing and businesses that do business with Boeing, especially if they refuse to remove these planes from their fleet.

What Boeing committed here is leagues beyond the recent emissions scandals. It's criminal and the perpetrators should be afraid of the coming justice. This should honestly be as close to a company-ending event as one could imagine. We shouldn't treat this lightly, slap on the wrist, business as usual. This must never happen again.