The two men are doing a 'pre-flight,' which entails inspecting the aircraft, which is a classified aircraft that flies at the highest of heights. The two pilots are named Rob and Franklin. The pilots have named the aircraft SR-71 Blackbird because the plane is an iridescent black like the feathers of a blackbird.
Rob and Franklin are preparing for a secret mission to take place in the USA. Because it is summer, the two pilots are thinking about the climb to the altitude and how to keep safe. Once they take flight, the destination will be Arizona. The two pilots are ordered to take pictures of the ground from the Blackbird plane. They are to look for a great treasure, an ancient treasure of buried weapons.
Due to the high altitude, Rob and Franklin hear nothing but pure silence, no smells, no touch. No one else is around because the plane flies so high.
It turns out to be a good mission. Rob and Franklin land safely, find the ancient weapons, and save the USA.