I just got my confirmation for my flight to San Francisco to ZendCon happening in early October and noticed something interesting on my invoice for the flight in the "taxes area".
Taxes, Fees and Charges
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Canada Airport Improvement Fee 20.00
U.S.A Transportation Tax 15.54
U.S Agriculture Fee 5.15
Canada Security Charge 7.94
Canada Goods and Services Tax (GST/HST #10009-2287) 26.01
U.S.A Immigration User Fee 7.21
Why would an airline ticket include the U.S Agriculture Fee, is there a tax on the air above the US farmland or something?