I met OTIS for a career fair at my university. They invited me to do an interview on campus the next day, where I met with someone in HR from CA and a local manager from IA. I was then invited on the spot (which is rare I guess) to attend their Super Day, where their top 10 candidates West of the Mississippi would be interviewed.
Their Super Day was originally supposed to be in LA, CA, but because 3 of the top 10 candidates went to Iowa, they decided to move the Super Day to their Des Moines office. At their Super Day, you did a panel interview with a group of executives, did a writing sample, a role play, and did a presentation you were asked to prepare in advance. I received an offer about a week later.