Yes, the ability to use co-terminal needs some clarification on the HP. So far the only "valid co-terminal" options that we see are the ones listed on AA.com:
http://www.aa.com/aa/i18nForward.do?...orld_rules.jsp

Others just show "see IATA Air Tariff" but googling that gets us the run around.

Is there a reliable list that we can refer to for co-terminal options?



Examples:

The more obvious ones are of course listed on the link above.

But how about GMP and ICN? JL flies HND-GMP and NRT-ICN (HND and NRT are also co-terminals). Is it possible to fly HND-GMP=ICN-NRT without GMP=ICN being considered as a segment?

Same with SHA and PVG - is it okay to fly HND-SHA=PVG-NRT without SHA=PVG counting as a segment?

I'm sure there are more of these that people can come up with (i.e. UKB=ITM=KIX is also possible?)