Yes, you are correct, for many airlines the remainder of the itinerary will be canceled if you miss a leg (and don't replace it). However, in some cases, it is

Yes, you are correct, for many airlines the remainder of the itinerary will be canceled if you miss a leg (and don't replace it). However, in some cases, it is possible to cancel a leg in advance (paying any change/cancellation penalty), possibly resulting in a lower fare...