This evidence is also given in Gita Chapter 8 Verse 6 that“O Bharat! It is a law of God that whoever one remembers at the time of death, he/she goes to him/her only.” As per this very law,
the soul of King Parikshit abandoning the material body(which had died
with the venom of the snake), went to heaven in its subtle body along with Sage Shukdev in an aircraft.