One answer to your question - Why do you recommend to not use the Quebec City airport? - We live in Hawaii, and found that we were able to save about $400 per person on air fare by flying into and out of Montreal rather than Quebec. Also, the scenery on the train ride is beautiful and the trains are wonderfully comfortable. Only bad part is trying to get a taxi from the station in Quebec City to your hotel. It might be worthwhile to try to reserve a hotel within walking distance of the station.