Google Books Ngram Viewer

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

1920 - 1941 1942 - 1945 1946 - 1968 1969 - 1998 1999 - 2008 aircraft English
1920 - 1953 1954 - 1987 1988 - 1992 1993 - 2004 2005 - 2008 aircrafts English

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