You also note that you purchased through Exepedia. Third party vendors have their own systems and rules. It may well be that if you miss downline segments and they are cancelled that the segments are cancelled, can't be refunded and haeve $0 value. Sounds to me as though what you are seeking to do is exactly what carriers spend a lot of money trying to prevent. If they do catch you, they will exact everything they can from you. This is something you need to take care of today. If this happens to you on departure, your choice will be to buy a new ticket at the walk-up fare (typically a whole lot more than what Expedia charged) if it is even available or to watch the aircraft push back from the gate while standing at the gate.