Originally Posted by
Dave Noble
That doesn't marry with what the OP is reporting
The airline has said that there is an additional fare collection of $100.50 - so implies a higher fare
The passenger would be charged the $275 and , if fare was lower, be given a voucher for the fare difference
AA lets you use residual ticket value if the new ticket is less towards the total add/collect, which would include the change fee. US, after the merger with HP, used to separately charge the change fee and do as you stated, but that's not how AA handles it.