Originally Posted by
Flying Lawyer
This would most likely not solve the issue for the OP. As a side remark: Traveling from Ostbahnhof to Hauptbahnhof by rail and not using the S-Bahn tunnel takes quite a while....
The airport to Ostbahnhof trip is shorter and platform changes take less time than at Hauptbahnhof. Add to that the time that it takes Railjet to get to M-Ost.
It would save him roughly 20 minutes in making his connection. Never understood why that train doesn't make the stop. Moot anyway, since it doesn't.