Summary
use the loftwing card in the earth, you can go back to the sky from anywhere, and you can freely travel between the earth and the sky.
LOFTWING Skyward Sword HD Link Zelda Amiibo NFC Tag Card Description
This tag card is able to be used on your Nintendo Switch/Wii U. Tested and working.
NO Figure, NFC tag only. Works perfectly in Legend of Zelda: Breath of the Wild!
This is an NFC tag written with the data to unlock special gear in Breath of the Wild! Works just like the Amiibo!
Function:
Usually, if you want to go back to the sky from the earth, you can only go through a specific storage point. However, if you use the loftwing card in the earth, you can go back to the sky from anywhere, and you can freely travel between the earth and the sky.