My pet and I both loved the new doggie carrier on wheels.  He liked it most of all because he was able to sit up while I was wheeling him around.  It also has 3 sides on ventilation.  He seemed so much calmer and easier to travel with him.  Once on the plane he settled in and feel fast asleep.  When I use to fly with my little Noah it was always such a stressful event.  Now with him liking his new carrier and airline approved ( the medium one ) Noah and I were both loving our travel experience.  No need for giving him a happy pill or myself!!