What is the passage mostly about?
a.the cost of flying during the 1930's
b.how pan am airplanes could land on water
c.why clippers were unique and special
d.how people travel in luxury today
![What is the passage mostly aboutathe cost of flying during the 1930sbhow pan am airplanes could land on watercwhy clippers were unique and specialdhow people tr class=](https://us-static.z-dn.net/files/d87/e2182d477dfe77f151b37d858b374710.jpg)