With Interjet, you'll receive pet transportation services, but not all pets can travel with you in the cabin. Only small dogs or cats can be transported with you. Simply bring a carrier that fits under the airplane seat, and you can bring a maximum of two animals with you. 

That depends. Children up to 24 months, or two years old, won't have to pay admission, as they can travel on your lap. You can buy one for them if you want, but it's not necessary. If your child turns two before the flight, you'll need to buy a ticket, as they'll need their own seat on the plane. 

Again, it depends on the equipment. Skis, golf bags, fishing equipment, hockey, and lacrosse equipment won't incur additional charges if they meet the maximum weight and height limits. The equipment will count as your baggage on the plane, so if you want more, you'll have to pay. If the equipment exceeds the weight and height limits, you'll have to pay fees.