Thank you pete for sharing the information you have , it really tells a story that all routes are performing well in these current hard times , and the decrease seems to be the cessation for no particular reason of ex RYR routes (BIQ, OPO, NDN & KRK) .
No doubt Istanbul is the pick but even Stuttgart increased without extra
capacity
It's interesting you mention Stuttgart as i'm a pretty regular user of this service and when i travelled in september both legs were pretty much full. This is a little gem of a route and it's no wonder it's probably , together with Milan , one of the only routes that still survive having been passed down from the original birmingham executive days and has had continuous service. in my opinion it would be a prime route for the EMB175 , certainly in the summer anyway.