Originally Posted by
hotturnip
If you'll look a few posts up, you'll see that someone has provided specific examples to show that this is NOT the case. It's much more random. You kind of got in a rush to spout off that conventional wisdom.
There are some exceptions. Six flights (the three airport pairs cited, bidirectionally) doesn't change the value of the generalization. Look at the city pairs in the link I provided where DL brought back domestic coach food service: there's a competitor (or more) on every route. Why those, and not every route longer than x,xxx miles?