I was hopeful that the veterans would be able to help me out on this one. I was originally scheduled to fly out of BWI to SYD via SFO on December 25th. Today, I noticed that some business class seats became available so I called in to change my routing. I was able to change the ticket, but was charged a 75.00 change fee. The only difference between my old flight and the new one was the original left out of BWI and flew via SFO and the new one leaves out of IAD and flies via LAX. I was under the impression that a co-terminal agreement existed between DCA/BWI/IAD and that change fees were typically not applied to these tickets. I reviewed the fee chart on the website, and found it somewhat confusing. Does this sound like the change fee was charged correctly? Or was the agent incorrect? Regardless, I paid the 75.00/ticket as the business seat is well worth the money .. Any help or guidance you guys could provide would be greatly appreciated. Thanks!