I have the first part of an ex-EU booking next week DUS-LHR-LAS, booked on AA.com with my BAEC number. I booked a back to back positioning flight to DUS using Avios - given the connection to LAS is not until the following day, the usual risks did not apply, or so I thought.

Today I received 2 pre-flight emails from BA with 2 different PNRs for the same DUS-LHR-LAS flights. Rather confused, I rang BA and the agent informed me that this sometimes happens where you book on AA.com and there are a mixture of BA flight numbers and AA flight numbers in the booking.

Don't really understand, but anyway he said it was not problem, except OLCI would not work and I would have to check in at DUS (landslide). This of course rules out my back to back positioning flight and I have had to pay £25 to change it to an earlier one, to give me time to go landslide to check in again. (I am not checking in luggage at DUS).

This all seems rather odd to me. Anyone explain what is going on please? Why would BA send me 2 emails with 2 different PNRs for the same flights?