Russian pilot was a Nav with a pilots licence but there was no record of any training

[ATC Watcher]

WHBM :

Because you have no choice

Mainstream Aeroflot also fly Moscow to Kazan

Of course they do , but my point was that you cannot be sure what type of a/c and/or what airline will do the trip that day in the end. It is not your choice, even if you buy a mainstream carrier ticket.