I fly about every other month with Toto and I bought the Sherpa Deluxe ... lots of places sell it online for about $55 - $65! It's perfect for her and if it's a little snug under the seat, because it's the softsided, it will still fit. I believe, if I'm not mistaken, that these bags were designed by a stewardess! I bought it several weeks before her first flight, didn't make a big deal of it, just sat it in the den floor with the end unzipped. I watched her for a few days and as soon as she began sniffing it, I unzipped the top and would occasionally drop a favorite toy, treat, etc. in the very back [again, making no big deal of it]. Before long she was quickly grabbing the "bait" and running with it. And not long after that, she was getting inside and napping, etc. At that point, I tucked her favorite blankie in there, told her to "kennel up" and she would hop right in and I began taking her places in it instead of her regular bag which I usually carry! One important thing we did was never, ever take her from the bag through the top opening! It's too funny ... even though we keep the top unzipped and she stands up where she can see everything, she patiently waits for the front to be opened before she gets out!! It's just a safety thing ... we don't want her jumping out the top and even if we sit her on the floor in the airport, she never even tries to come out the top! Amazing little babies, our Yorkies!!
