In this letter from the artist Bernard Boutet de Monvel (1884 - 1949) he explains thoroughly his thoughts and adventures as a bombardier in a Vosin bi-plane; experiences which contrast greatly with his days in the trenches and he writes well on the feelings of loneliness that an aviator can experience at 2000 feet.
For those who are interested in learning about the living conditions and daily life of World War One pilot officers this article can only help you.