Math Question on probability

Math Question on probability?

You own an airline company called NFL Air (motto: “Pass a good time our way! The probability of a safe flight will never be less than zero.”), and you have only one plane to service Green Bay (WI), Philadelphia (PA), Jacksonville (FL), New Orleans (LA), Boston (MA), Houston (TX), Phoenix (AR), Seattle (WA), Denver (CO), Buffalo (NY) and Oakland (CA). Every city must be serviced each day but will be serviced only once each day. How many routes are possible if you must begin New Orleans and must end in Green Bay and you may not revisit any city?

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Start in NO, 9 choices for first stop, 8 for second, etc. to end in GB; total possible routes 9*8*7*6*5*4*3*2.