I'm Russian. I have no Schengen visa. I want to buy a ticket going via Schengen Area with a transfer less than 24 hours. A transfer will take place in an international airport of Germany, or Spain or some others. I have several options. The thing is, it'll be an international airport with a transit zone and I won't leave it.
If I buy a normal a single ticket, there'll be no problem with the transfer or transit. For instance, Brazil - Portugal - Turkey.
However, I've discovered that the price of 2 separate tickets on the same route with the same tranfer and duration will be cheaper, around 2 times.
The tickets may be even of different airlines. Still, the condition will remain: no chaning of an airport, no leaving the transit zone, the duration of transit will be less than 24 hours.
Now, people tell me that in case of 2 separate tickets I'll face a problem with boarding. That is, the 1st airline will take into account only the 1st ticket and neglect the 2nd one. For some unclear reason.
Because those would be 2 separate tickets, possible of different airlines. Or even of the same airline, but if they're 2 physically separate ones, there would be a problem.
For an airline it'd look like as if I travelled only half-way, with a single, one-way ticket to Schengen Area. And, therefore, it'd reject to board me in the beginning.
Is this true? If so, what is the rule what doesn't allow to travel with 2 separate tickets via Schengen? And only allows to have single physical one
Is this according to Timatik in the first place?
Note, that I don't take into accout a checked-in baggage - I may have none. Therefore, for the sake of simplicity, suppose I won't have it.