Pros of Airplanes: Goodnfornscouting out enemies bases and after the machine gun was added they became a good offensive tool. Also it was used for faster travel.
Cons: The technology was new and untested so pilots had a hard time piloting. It also was too crampt to get a parachute in the airplanes. Also it was time consuming and difficult to make.
Information: The aircraft at first was primarily use for scouting missions and gained intel of the enemies such as locations After the planes gained machine guns it was also used for offensive tool for most militaries.
Quote: Air power either end war or end civilization. - Winston Churchill, House of Commons, 14 March 1933
http://www.enotes.com/homework-help/what-were-pros-cons-wwi-airplanes-603857 | http://www.theaerodrome.com/aircraft/statistics.php | http://www.militaryfactory.com/aircraft/ww1-aircraft-ranked-by-speed.asp | http://www.militaryfactory.com/aircraft/ww1-aircraft.asp | http://www.skygod.com/quotes/airpower.html