Originally Posted by
christep
Because with the online tool you can't choose the issuing airline, so if the online tool's chosen airline isn't AA you need to go through a GSA or TA in order to get the cheaper AA proices.
And AA doesn't serve either WAW or ARN, thus (most likely) you'd be looking at BA as the issuing airline (just guessing, but most folks would be taking WAW/ARN-LHR as their first leg) thus ensuring BA fuel charges.
What are RJ's taxes like if they were to ticket?
IIRC AA does all of RJ's xONEx online issuing for them.