It was first published in 1993 by Harper Collins. In the years since then, Scholastic published it, it was made into a board book, and a Braille edition was published, too. Then in 2017, it was published again by Atheneum Books for Young Readers. There are videos of Joyce talking about this edition. I think his art is fine but the Native content of the story... not fine.
Using Amazon's look inside feature, I see that the main character is an orphan boy named Art Atchinson Aimesworth who lives with an aunt and uncle who run a Wild West Show. Art has a sister named Esther and his best friend is "Spaulding Littlefeets, a young Comanche brave." Here they are:
Also not great? Spaulding is wearing a headband. That's odd, too. Here's a look at that, from the next page:
The story is set in 1908, in Abilene Texas. Art receives a box from Santa Claus. Inside is a flying machine that Art, Spaulding, and Art's sister, Esther, put together. The basket they're supposed to ride in is broken, so they use Spaulding's canoe instead. Why did a Comanche have a canoe? Comanches are a Plains nation. I suppose he might have had a canoe, but a horse would have been more accurate. The kids could have figured out something to use instead of a canoe.
That's all I can see online. If I get a copy, I'll be back!