Originally Posted by DocH
...Do all tickets in the itinerary have to be in basic season for the country in which each flights originate, or are just the seasons of the country of origin relevent?...
From the star file:
162N . ... THE DATE OF THE FIRST
163N . INTERCONTINENTAL SECTOR DETERMINES THE APPLICABLE
164N . SEASONAL FARE FROM THE COUNTRY OF ORIGIN FOR THE
165N . ENTIRE JOURNEY.