Sentence 1: Ted was terrified of flying, but he had to make a business trip. 
 Sentence 3: He was fine at first, then the plane started rocking and shaking 
 Sentence 4:  Greg was terrified and believed he would die 
 Sentence 5:  When the turbulence stopped, Greg realized how lucky he was 
 Option 1: While boarding the cruise ship, he thought about them sinking. 
 Option 2: While boarding the plane, he thought about airplanes crashing.