Originally Posted by
alex0683de
As a rule of thumb: one take-off + one landing = 1 segment. So PHL-ATL = 1 segment, PHL-CLT-ATL = 2 segments, LGA-PHL-CLT-ATL = 3 segments and so on, as long as each flight has a unique flight number.
A better rule of thumb is one boarding, one segment. That avoids counting two segments on a one stop flight to your destination. However, there are some cases on international itineraries where you change planes under the same flight number and probabaly only receive one segment credit.