Summer storms in the midwest are incredibly dynamic. I don't think people realize how far aviation meteorology has come and I'm sure those in that community will write a thesis on this event.
I take 1889 a few times per year. I've been on planes struck by lightning that could not continue, one of which was quite disconcerting. This would have surely been frightening even for the most seasoned flyer. Glad this turned out ok for all (except the aircraft).