We are planning to do the following route (Global Explorer)

London LON
Moscow MOW (surface to Delhi)
Delhi DEL
Tokyo TYO
Hanoi HAN
Hong Kong HKG
Melbourne MEL (surface to Sydney)
sydney SYD
papeete PPT
easter island IPC
Santiago SCL (surface to RIO)
Rio de Janeiro RIO
London LON

The problem is that there is no direct flight between Moskouw and Delhi. How do they calculate the miles??

Greetings,

Fred.