What were the features and the purpose of airplanes in world war 1 ?

Those were old planes back than so their purpose was mainly for transportation to fly over to allies/enemies territory and also attack enemies from above like drop bombs, rockets, and grenades from above as surprise attack like the expression death from above, so mainly the planes were at average speed to take people in good time instead of walking on foot but mainly it was used for war purposes.

George washington was the first