So I will be making a third trip to a small mexican city that is served by one daily ERJ flight. Doing business in Mexico is not something you can set your watch by. My last two trips I had the need to change flights and could not on two occasions due to oversold situations. So my question is. Can I buy a one way ticket to this city and two one way tickets (refundable on different days) to return to houston? If I use the earlier ticket I refund the later. If I need the later ticket I refund the earlier before flight time. I know this is lost revenue potential for CO, but I don't see where I have a choice due to the seemingly constant oversold situation on this route. I do not wish to stay in this town any longer than needed so simply buying the latest possible day and staying extra when I do not need to is not an option.