What did Antoine de St. Exupery transport between Toulouse and Senegal?

They carried letters of peace and love.

Explanation:

Saint Exupery was a commercial pilot before World War. He started his job in the French Army and then he was transferred to the French Air Force. To revive the air postal, a community was set up and it had risked their lives to carry letters of peace and love from Europe to Africa. He also tried to negotiate inthe release of people taken as hostages. It was a difficult task and he earned a good honor from the French Government.