99B- The early afternoon itinerary is all mainline jet service on a single airline
So then - Toronto to Medford... this sounds like United and frankly there could be any number of different aircraft between Toronto and Chicago. It's a short flight but I once flew it aboard a UA DC-10 in 1993. Anyway, let's go with United all the way --> Toronto to Chicago aboard a 737-300, Chicago to San Francisco aboard a 747-400 and San Francisco to Medford aboard a 727-200.