I was thinking of checking that out until I read a little about it. It is based on a true story, but one of the lead characters has been changed from a man to a woman. I don't mind a story about a man and a woman in a hot air balloon, but since they bothered to set it in the same historical period, I don't see a woman as a scientist going up in a balloon in that period. After reading your description, it sounds like it is worse that I thought.
If it was just having some anachronisms about blacks in the background, I’d say go ahead and watch. But, it is ridiculous that they completely changed a man into a woman. I’ll admit, I didn’t know the true story beforehand. The woman acts as a pilot and not a scientist, but she is of course amazing as women in modern productions have to be. Feminist reviewers expressed disappointment in finding out she was invented for the movie. LOL.