Rescue Plane Size

I am taking a WestJet flight tomorrow due to a cancellation, and I was out on a “rescue flight”. I’m not totally sure what that means, I’m assuming it’s a smaller plane. Has anyone ever taken one of those and knows how big it is? I’ve flown front seat in little cessna 4-seat planes before so I wouldn’t say I’m scared of flying but a little anxious about being on a little plane, and just wondering what to be prepared for size-wise. TYIA!

Update: cancelled AGAIN. WestJet’s only offer was a flight Wednesday (my return flight was Thursday). No trip extension to what mine was supposed to be… anyways wish me luck on the bus ride and avoiding WestJet at this point smh