I experienced something similar, Google thought that the Geschäftfuhrung (management) at the bottom of the booking email were my co-passengers:
http://i.imgur.com/I8V4ZQN.png (In this case, Thomas Lindner and Dr. Jochen Wallisch)
Looking at the mostly-redacted names OP's screenshot I suspect the additional "passengers" Google's email has picked up are actually Dr Axel Schmidt and Oliver Wagner from Germanwings' executive board? Am I right?
[0] http://www.neuro.univie.ac.at/
I experienced something similar, Google thought that the Geschäftfuhrung (management) at the bottom of the booking email were my co-passengers:
http://i.imgur.com/I8V4ZQN.png (In this case, Thomas Lindner and Dr. Jochen Wallisch)