Yeah, I know it only affects a small percentage of their aircraft, but the vast majority of the passengers do not. Their website also doesn't list what specific model of 737 is going to be on that route, so you might have more than a few passengers see that its going to be a 737 and decide it isn't worth the perceived risk. The media isn't also going to spend the time to explain the differences between the models, they're just going to say "737", and leave it at that.
Biting the hand that feeds IT
