Originally Posted by
Often1
Very much doubt that dispatchers working with ATC make diversion decisions based on rerouting alternatives.
An aircraft at takeoff is almost certainly too heavy to land back at a smaller airport. The longer the runway the less time it has to spend in the air and the less fuel it has to dump (a last resort for emergencies). Thus, diverting to a longer runway will always be a priority if all other factors are at least equal.
We don’t have dispatchers, they’re a North American thing not used in many other parts of the world. All decisions are made by the flight crew.
A320s can’t dump fuel.
In the event of a failure affecting landing performance there are a big set of tables which give the new landing distance required. There’s a strong possibility that Linate would be too short for some of these failures especially as there is pretty much normally a tailwind at Linate.