Something interesting is happening on the flight. As everyone got seated with plenty of seats untouched, someone unexpectedly screamed while the flight took off.
Hannah's face is not very good at the moment. In the true sense, Hannah found out something about herself, and others noticed it. She is seated beside Samuel and is overlooking the window. It was her first time flying; it was the first for many people: Samuel and Adele are also included in that category. But they seemed fine, apart from the momentary discomfort at the beginning, but Hannah was not taking this flying thing smoothly.
She found out through experience that she was afraid of heights. She held Samuel's arm for the entire time when the flight took off. She was confused, but Samuel quickly caught on to it and calmed her down.