WestJet Airlines
Spent a long time on the phone w and agent just to reserve a seat for my son beside my seat , since I booked his flight after mine, and was reassured that our seats were side by side. The night before the flight I found out our seats weren't next to each other (he's 9 years old), and when I called in again, they told me I'd need to pay $200 to upgrade to side by side seats.