12. (1985) This is the year you finally take the family to Disney World! Disneyland is closer to your home in Portland, Oregon but Orlando also offers SeaWorld, Baseball World and Circus World. Though it’s always a challenge flying anywhere with three young children, you’re pleased to discover that between Portland and Orlando there’s a single daily one stop direct flight. Identify the airline, aircraft and enroute stops.
Routing via DEN verified. Not UA or Frontier Horizon or CO
Well, dang, gotta be plain ol' ordinary Frontier, which means a 737-200, which imo means it would feel like a very LOOOOOOOONG day
Frontier with a 737-200 is correct! DEN-MCO at 1540 miles would have to have been one of the longer 737-200 flights out there, though right up to the People Express takeover, Frontier's 737s retained the quality seat pitch for which the airline was well known.
Frontier FL 176 Portland (PDX) 630a-956a B Denver (DEN) 1040a-411p L Orlando (MCO) 737-200 Daily
17. (1989) You’ve got some old air miles sitting around in your frequent flyer account and you’ve just received notice from the airline that they’re due to expire in three months. From your home in Seattle, you’ve got just enough miles for a domestic roundtrip within the continental U.S., so a ski vacation in Utah on the powdery slopes of Alta might be nice. Unfortunately, your airline doesn’t fly nonstop from Seattle to Salt Lake, but it does offer a single daily one-stop direct flight. Identify the airline, the aircraft and the intermediate stop.
Alaska (Horizon) operated 37-seat de Havilland DHC-8 turboprops between SEA and Sun Valley (SUN), and I'm pretty sure they also ran SUN-SLC in ski season ... "daily" strikes me as odd, but there's nothing odd about this sort of question and answer here 
You're right about that,
J, and Horizon Air with the Dash 8 is a very reasonable guess. Unfortunately, it's not the correct answer though. The airline we're looking for operated a jet with a First Class cabin, making a brief stop at a hub airport.