Was playing with the planner tool last night as I'm seriously considering a DONE4 RTW for my birthday this year. The routing I'm looking at is
AKL-xHKG-JFK-DFW-ANC-DFW-BOS-LHR-MCT-LHR-
BOM-HKG-DEL-NRT-
SYD-AKL
The OneWorldRTW tool flags two errors (red exclamation mark and all, for the cities highlighted above). The error reads
you can only have one intercontinental arrival and departure on each continent
(i can see why it flags the arrival into BOM and departure from NRT to SYD as an error, as I'm yet to select the flights and only transit in HKG on my way from AKL to JFK, which would make LHR-BOM the first entry into Asia and NRT-SYD the departure form that continent)
Now, am I right in understanding that if the first entry into Asia is a transit then the itinerary is a valid one?
FWIW, mileage monkey says Yes.