My daughter has never been on an airplane before. This will be her first time.
この場合、次のような言い方ができますよ。
ーThis is my daughter's first time on an airplane.
「今回が娘の初めての飛行機です」
ーMy daughter has never been on an airplane before. This will be her first time.
「娘は今までに飛行機に乗ったことがないので、今回が初めてになります」
ご参考まで！
カナダ 
