When you get a ticket, check the schedule to make sure it is not the last flight of the day. That way, even if you miss it, they will put you on the next plane. When I was flying to Kirksville, MO to interview at KCOM, I was flying from NYC, was supposed to change the plane in Minneapolis, and then in Kansas City. Guess what, my flight from NYC was delayed for one hour. It was not a problem in Minneapolis, because they just put me on the next available plane, but it was a HUGE problem in Kansas City, because I missed the last plane going to Kirksville. I could rent a car and drive, but I just got my licence last month and do not feel comfortable driving so far. I ended up taking a cab and paying a fortune to go 180 miles from Kansas City to Kirksville. Anyway, even if you do miss a plane, I am sure the admissions will understand and let you reschedule or something.
Good luck.