Can you not do this without my help for the purposes of answering the question? Use a hot air balloon for all I care, dodging the point by invoking irrelevant technicalities is not the behavior of someone who has an actual rebuttal.
So if a hot air balloon is orbiting the Earth and a baby is born....
To technically answer you question, jus soli is "right of the soil". Being born of foreign parents within territorial waters, within an American embassy compound, or in the airspace of the United States would not entitle a person to de facto citizenship, unless a court so ruled that it did. In the past, they have not been so inclined. Babies born in the air are generally assigned a birthplace according to where the plane lands, but it does not follow that jus soli would also apply. In any event, there is a near zero chance that a foreign baby born in U.S. airspace, but not landing in the U.S. would be given jus soli citizenship.
That is the technically correct answer.