I wouldn't call that a spam line. That's a highly centralized route network from airports that support real world hubs.
The only things that makes a spam line a spam line in my book is the circular blue pax (i.e. flying from tiny airport to tiny airport with a massive amount of seats, hubs on each end...)
The airline is bigger than a real world counterpart, but AE also has about 4x the O&D demand for most airports in the world.
So, symptom of the game rules, yes. Spam line, no.