Waiting

Spent the day in Chicago on business and went to airport at 3 pm for 4:30 flight to Champaign/Urbana. Time for departure increased to 7 pm because crew was somewhere else. Finally boarded the plane and then another hour wait because there was confusion about who was and was not on the plane. Finally took off for 30 minute flight at 8pm. Why didn't I just rent a car?