YOU SAID:
i haven't been on an airplane
INTO JAPANESE
私は飛行機に乗ったことがありません
BACK INTO ENGLISH
I have never boarded an airplane
INTO JAPANESE
飛行機に乗ったことがない
BACK INTO ENGLISH
Never boarded an airplane
INTO JAPANESE
飛行機に乗ったことはない
BACK INTO ENGLISH
Never boarded an airplane
You've done this before, haven't you.