Not really sure what you mean by job shadow. I am a commercial airline pilot of a major carrier and help mentor with flying as a career. I have a big flying family and have grown up around aviation (I'm from the NW). I can guide you in the right direction and answer any questions you might have as far as what you want to do for a career and what steps to take. If you are looking to be an airline pilot, there is going to be a huge shortage in the next decade and all airlines are hiring like crazy currently. The future looks bright and I love what I do. Let me know if I can help you further.
Ontario's airport is small, but, it does have a fixed based operator. Looking at the website for the airport, I'd contact the FBO, airport manager, or a local flying club. Ask them for referrals!!! As far as actually being able to fly with a pilot, I don't know if you will be able to do that, do to liability concerns, etc. However, there is a LOT to learn on the ground about aviation! All pilots have to check weather for the entire route, pre-flight the plane (check mechanical, lighting, etc), etc. The people on the ground handle emergency diversions due to weather, medical, etc, and make sure everything is coordinated. The FBO should have an Operations center, as should any commercial airlines. I would encourage you to look for small commercial flights, perhaps small cargo operations or medical flights. I worked as an airport police officer, and was very impressed by the coordination of activities handled by the major air carrier Operations offices!
Good luck to you!
Frankly, this is going to be tough, because most companies have strict rules about who can be in the flight deck. My advice would be to find a local flight school that offers introductory flight lessons. You can fly with an instructor for 30 minutes to an hour, and they can answer a lot of the questions you may have. Aviation is a great industry, and there has never been a better time to get involved - good luck!
Take a look at Treasure Valley CC. They have a flight program and might be able to give you a few ideas. https://www.tvcc.cc/aviation/index.cfm