It's not a good idea to order parkings in a "neat" order, in FS9.
Because, FS9 uses that ordering to fill AI so, it's best if you keep it random, so the parkings will be filled with AI in a more realistic way, rather than first all the 1st terminal, then the 2nd one, etc.
FSX it's different, it doesn't use the ordering in the AFCAD to assign AIs, and it always reorder automatically the Go To Airport list.