Strange thing, IMO. On my recent flight, CLE-IAH-HNL-GUM-CNS, I got credited with 3 flight segments, which is correct, but strange.
There were 3 flight coupons, and that is what counts: CLE-IAH, IAH-GUM, and GUM-CNS. The strange thing is that not only does IAH-GUM have TWO boarding passes, there is a change of aircraft in HNL, and the flight goes from CO 001 to CS 001!
No complaints, just find this interesting (although it does hurt me with the CO promotion of "fly 4 more segments in this time frame than you did last year, and we will give you a 4K miles bonus").