A few weeks ago I was flying alone on the inbound leg of a round trip from New York to Europe on Swiss in economy class (W fare class). When I was boarding, the gate agent said, "congratulations! you have a new seat!" and handed me a paper slip indicating a business class seat for me. Of course I happily took the opportunity and had a great flight.

But I'm left wondering - why me? I don't currently have elite status on any airline, and in the past never had it on Swiss or another LH-group carrier. Was it totally random? Was it because I was among the last passengers to board? Or perhaps because I had selected one of the best economy seats to begin with? Maybe because I had travelled in Swiss business once before (on a United mileage ticket)? Because I complained to the check in agent on the outbound flight that I had gotten stuck with a bad seat? Or because I was travelling alone and fit some demographic they have in mind as someone appropriate to sit in business class?

In short, is there anything I can do to maximize my chances of this happening again?

Thanks!