Originally Posted by
beardoc
Although my experience is only an n=1 study, I've had QANTAS take over an IB ticketed DONE5 in the past and reissue with no fuss at all.
Back in the days of hand-written paper tickets, at the time of re-routing, it was quite easy for one carrier to take over the ticket: they (in my personal experience: AA airport ticket offices in SCL, CDG, JFK, or MIA) would simply exchange unused coupons issued by one carrier (QF) for new coupons issued on 001 stock.
How this works with VCRs, I have no idea - since all my RTWs booked in the e-ticket age have been issued directly by AA/Mindpearl (or in the halcyon days, by a travel-agent in Canada).