I booked the full 20 segments for my AONE4, so I think it has to be a paper ticket, but in contrast to the AA office in CAI last year, the ticket is not handwritten - it is machine printed. I did ask the BA people at MRU if they could FedEx the ticket to me (like AA in CAI were willing to do) but they politely declined. Unlike others who have reported their experiences here already, I did not have to sign anything (e.g. receipt or credit card slip) but maybe that was because of the last minute nature of the handover. All I had to do was show the agent my passport and the ticket was in my hand.

Regardless of whether you have a paper ticket or an e-ticket, you still need a boarding pass to get onto a plane. So it seems to me that you will still have to be met by somebody from BA or Servisair with the boarding pass because there appears to be no transit passenger desk in MRU - but perhaps I missed it? The alternative is to clear immigration and show up at the normal check-in desk, but I would not recommend that with a 50 minute turnaround.

It is clear (from other reports) that the ground operation at MRU is very different for the mainline BA flights from LHR and the weekly Comair flight from JNB.