how to calculate miles on gloabl explorer?
 

thank you

I use great circle mapper. The result is typically only a few miles off from the system the airlines use (depending on the airline). I believe you need to count surface sectors.
BIO-LHR-YYZ-LAX-SYD-AKL-HKG-VVO-DME-LHR-MAD-BIO is above 29.000.

Great Circle Mapper

Could you turn AKL and SYD around? Or connect in Spain to go to YZ? Or end in MAD?

instagraphic.
Welcome to Flyertalk. Hope you stick around.

FYI on most forums its bad to edit your initial post after getting an answer.
Why - well subsequent responses become somewhat difficult to read, others might have similar questions, or other posters might have alternative views.

I don't keep myself up to date with the Global Explorer fare rules, and so I too thought that surface segment mileage had to be included.
But the fare rules have changed since I last looked, and there are two changes concerning the mileage of surface segments:

1. If you do not return to the point of origin, then the mileage of the resulting 'open jaw' must be included. The relevant rule is:
   
   Quote:

   ---

   4(d) Travel may originate at any point for which fares are published and must terminate at the same point, except that origin-destination surface segments are permitted as follows:
   a. within country of origin
   b. within the Middle East
   c. between USA and Canada
   d. between HKG and China
   e. between Malaysia and SIN
   f. within Africa
   g. between Maldives and Sri Lanka/India
   NOTE: Mileage for origin-destination surface will be included in the total mileage

   ---

2. But the mileage of other surface segments are no longer included. The highlighted words from an old version of the rules have been removed in the current version:
   
   Quote:

   ---

   4H. Intermediate surface sectors are permitted at the passenger’s expense. Transoceanic surface sectors between TC1-TC2 and TC1-TC3 are not permitted.
   EXCEPTION: For travel originating in the South West Pacific, one transoceanic surface sector between TC1-TC2 or TC1-TC3 is permitted.
   Surface sectors must be included in the total mileage.

   ---

So, [MENTION=899469]instagraphic[/MENTION], it looks like your proposed itinerary
BIO-LHR-YYZ-LAX-SYD-AKL-HKG-VVO//DME-LHR-MAD-BIO
will be 25,176 miles
(and welcome to FT)

Now to update the https://www.flyertalk.com/forum/onew...ule-sheet.html

Also, this old thread discussed the differences between the Global Explorer and Oneworld Explorer tickets - https://www.flyertalk.com/forum/onew...rld-explo.html