Which year do summer classes account for in the academic year?

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Sorry if this is a stupid question 😕. If I took summer classes in 2009, does it account for the 2008-2009 academic year, or the 2009-2010 academic year? I can't find my answer so thought I'd ask here. Thanks.

Someone correct me if I'm wrong, but I would think it's 2008-2009.

For 2008-2009:
First semester = FALL 2008
Second semester = SPRING 2009
Third semester = SUMMER 2009

Then it moves onto 2009-2010.
 
2009-2010

AMCAS years begin with the summer term.
 
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