Only 2 airlines operate this route, and both are ala cart services (as opposed to bundled). So if you are travelling with checked bags, you don't have a choice but to pay extra. (Be aware that baggage rates can vary between the airlines, but are generally set and don't fluctuate like ticket prices. A bit of homework maybe a appropriate, e.g. ticket price saving vs checked bag (etc) charges, before you book. It is important to note that both airline websites make the baggage situation abundantly clear during the booking process.)