Sources

Picture of Messerschmitt
https://www.google.com/images?as_q=Messerschmitt+262&tbm=isch&tbs=sur:fmc#facrc=_&imgrc=Xc7jxZD3LKgDVM%253A%3BWWQsp-dY1mhF8M%3Bhttp%253A%252F%252Fupload.wikimedia.org%252Fwikipedia%252Fcommons%252F3%252F3d%252FMesserschmitt_Me_262_replica_D-IMTT_ILA_2012_04.jpg%3Bhttp%253A%252F%252Fcommons.wikimedia.org%252Fwiki%252FFile%253AMesserschmitt_Me_262_replica_D-IMTT_ILA_2012_04.jpg%3B2600%3B1462

Picture of spitfire
Spitfire

Picture of North American p-15

http://www.google.com/imgres?tbs=sur:fmc&tbm=isch&tbnid=kvN9vjKSrStx9M:&imgrefurl=http://en.wikipedia.org/wiki/North_American_P-51_Mustang&docid=k_ItVZogJysCrM&imgurl=http://upload.wikimedia.org/wikipedia/commons/0/0d/P51_Mustang_Wairarapa.jpg&w=1650&h=1099&ei=EHnwUqzhK4T5kAXH54GICA&zoom=1&ved=0CEIQhBwwBQ

Picture of Battle of Britain
http://commons.wikimedia.org/wiki/File:Models_being_prepared_to_be_flown_in_the_1966_film_%22The_Battle_of_Britain%22_at_RAF_Duxford..jpg

BATTLE OF BRITAIN
http://www.ducksters.com/history/world_war_ii/battle_of_britain.php

Reason people used planes(I copied this one because I didn't find my own words)
http://wiki.answers.com/Q/How_were_aircraft_used_in_world_war_2#page2

List of planes
http://en.wikipedia.org/wiki/List_of_aircraft_of_the_United_Kingdom_in_World_War_II