At the begining of the leg, before rolling the dice, if the captain is alone in the aircraft, he can decide to take a treasure from this city or attempt to go farther on his own. The captain may continue on his own for as long as he is willing to risk it.
If he decides to take a treasure, the journey is ended and a new one begin.
Example
Amelia is the captain, and Orville is the only passenger. After Amelia has rolled the dice, Orville decides to get off the aircraft. Amelia cannot get off now because there were two players on board at the beginning of the leg.
Amelia succeeds in overcoming the events and reaches the next city. She is then alone on board at the beginning of the new leg. She chooses to land, so she does not roll the dice and draws the first “Treasure” card of the city where she lands.