That AIP reference seems to be in regards to filling out the paper form somehow sending that to them, but can you direct into NAIPS? I entered ETD as 291500, and this was the response:
Your flight notification as shown below has been accepted:
Flight Details:
(FPL-NOSEND-VG
-EVSS/L-V/C
-YGAW1500
-N0090A025 DCT
-YMBD0030
-REG/ABC PER/A)
(SPL-NOSEND-YGAW1500
-YMBD0030
-E/0400 P/1 R/E A/WHITE C/BAS SCHEFFERS X/0401 234 567)
Now which 1500 is that? Unless it is truncating the "29" in output only, did it accept it for today, not tomorrow?
As a side note: it seems NAIPS has stopped accepting any registrations that are not 3 letters. ("4467" resulted in "registration not known") Better 'ava word...