Since SW opened up today for our october trip and I was able to book for everyone going through Philly, I decided to also book the few legs I needed with Spirit through AC. Tonight I was double checking all my reservations (booking for 10 people total ) and noticed that all the Spirit fares had gone down $10 each way. I tried to get the credit voucher on-line for the difference as I've been able to do on all my recent trips and it kept coming up with a "$40.00 per person change fee will be charged to your credit card". So I called Spirit and was informed that as of the end of April they had changed their policy on being able to book and then get the lower fares when offered - sure enough, they will now charge $40. pp for any change !!!! I asked her how they're going to continue competing with SW with those kinds of customer un-friendly policies!!! Hope we continue having good service from SW because that's who we'll be flying from now on!