Originally Posted by WearyBizTrvlr

While this may not be relevant to BA ex-MRU, it might nonetheless be an interesting data point: Using the AA RTW desk, I had to change the start date of an AONE4 that had already been ticketed. This resulted in the cancelation of the original ticket, rebooking on the new one, and no new credit card activity. The new ticket was simply exchanged for the old one, so no refunds and no new charges.