Lawyers hate commas. but it makes much more sense if you simply put a couple in:
A MINIMUM OF 3 AND MAXIMUM OF 16 SEGMENTS,
INCLUDING SURFACE SEGMENTS BETWEEN ANY 2
AIRPORTS, ARE PERMITTED FOR THE ENTIRE
JOURNEY.
And as jerry a. laska pointed out, it's there because in the good old days you could ticket coupons with, say, TYO, NYC or LON and the ground transfer between the coterminals wouldn't count. It's one of the many features that were lost in the "enhancement" of e-tickets.