let me come up with a theory by contradicting my self :
flying has something to do with the juubi powers....so lets split juubi powers into yin and yang...
1-Sasuke will inherit the juubi's eye (yin)
2-Naruto will inherit it's phisical abilitiesn like black Balls (lol) and flying ability...(yang)
prove is Madara uchihaand Bobito ..they never flew befor but when they become juubi's jinchuriki...they gained the flying ability...also naruto who had yang powers of sage + TAILED BEASTS CHAKRA WAS ABLE TO FLY....
-problem is dat when the sage flew to outer space and split juubi was he still a jinchuriki of juubi or not??...
another problem with my theory...if flying is the phisical (yang) ability of juubi then why juubi himself couldn't fly????.....answer probably could be in kaguya who has the ability of flying......or maybe she gained the flying ability only after eating the chakra fruit...MY MIND IS IN SPIN!!! I DONT KNOW WHAT THAT KAGUYA LADY IS!!!....WHAT IS THE DIFFERENCE BETWEEN HER AND JUUBI??.......
I see 2 ways to gain the ability to fly:
1/make yourself lighter than air , like Onoki and Muu may do.
2/using senjutsu of the 6 paths , that's a common point between Kaguya , Hagoromo , Obito , Madara and Naruto.
OR to be the host of Juubi's chakra , another common point between them.
OR both.
Naruto gained the ability to use senjustsu of the 6 paths and got the 9 beasts chakras at the same time , so who knows?
It seems that the 2nd ability isn't a pure Yang ability but more probably a yin/yang ability.
Why is there only a Yang symbol on Naruto's hand if Hagoromo gave him a Yin/Yang ability?
Maybe sun=senjutsu and moon=rinnegan?