But a ryanair, or ryanair style system, could fly from a large part of the US (certainly the east coast) to a large part of Europe already without the XLR A321s

But a ryanair, or ryanair style system, could fly from a large part of the US (certainly the east coast) to a large part of Europe already without the XLR A321s. What new routes does it really open compared with the A321LR?