I know that tickets have an expiration on the use of the funds used to purchase those tickets. But if I'm remembering correctly, SW will let you extend the expiration date by 6 months for a $50 fee per ticket. My question is this.....say I have tickets with the expiration of 3/10/11 and I extend it to 9/10/11......do I only have to start travel by the expiration date? Or does travel have to be completed? Oh....and has anyone ever had SW let them extend the expiration twice? Or for longer than 6 months?