Why is St. Michael the patron saint of fighter pilots?

There is no patron saint of paratroopers but there are several patron saints of soldiers:

Acacius of Byzantium

Adrian of Nicomedia

Faith

George

Ignatius of Loyola

James the Greater

Joan of Arc

Longinus the Centurian

Louis IX

Martin of Tours

Maurice

Michael the Archangel

Nicholas of Myra

Sebastian

Stanislaus of Cracow

Theodore Stratelates