I have heard that if you do not travel the first leg of your round trip ticket, the airlines will cancel the return leg of your flight. My question is, what if you travel the first leg of your departing flight and not use the connecting flight on the same day to your final destination, will they still cancel reservations for both of your return legs ? I do intend to use both legs of my return flights.

Anyone know?

Edit: The thread title shouldn't read "canceling", but simply "Not using"