Quick question for you...

I am travelling on an award ticket yyz-lax via a quick stop in chicago, It is supposed to be business all the way and since I am not fluent in travel speak I don't know if this is right... Toronto to Chicago flt1001 in O class and Chicago to LA flt 109 in I class. To my understanding flt1001 is on a 319 which doesn't have business. I am confused (very obviously) Would anyone that flies this route please explain?
Your help is greatly appreciated, thanks!