I might be able to help. The problem is I have a very small airplane. There is not room for any kind of hard sided crate. I have two soft sided carriers with diminisions of 10" by 17" and 11" high. They are supposed to be able to hold a 20 pound animal. If you think one of the puppies would fit in these carriers I could carry the third puppy with a harness strapped to the floor behind the seat. If this will work I am available Friday through Sunday as long as the weather holds. The forecast looks good. I am based in Steamboat and can bring the puppies to Denver area or back to Steamboat. Let me know what you think.