Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1880 - 1917 1918 - 1938 1939 - 1941 1942 - 1979 1980 - 2000 aeroplane English
1880 - 1931 1932 - 1938 1939 - 1942 1943 - 1995 1996 - 2000 airplane English

Run your own experiment! Raw data is available for download here.
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