Thanks to airplanes, people can travel long distances quickly.
Literal
Airplane [thanks to-のおかげで], people [topic-は] quickly, long distance [object-を] travel-can.
Uses ~のおかげで ('thanks to') to credit airplanes for a benefit. 旅行できる uses the potential form of the suru-verb 旅行する, a more concise alternative to the formal ことができる construction.