Google Books Ngram Viewer

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

1800 - 1942 1943 - 1983 1984 - 1988 1989 - 1994 1995 - 2000 two aircraft English
1800 - 1954 1955 - 1987 1988 - 1989 1990 - 1996 1997 - 2000 two aircrafts English

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