When arranging the airports from south to north along the western coast of America:
- Santiago (iii) is the southernmost city on this list, located in Chile.
- Lima (iv) is next, located in Peru.
- Mexico City (i) is further north, in Mexico.
- Vancouver (ii) is the northernmost, located in Canada. Hence, the correct order is: Santiago (iii), Lima (iv), Mexico City (i), and Vancouver (ii).