I think your quite warm there Nigel, except for maybe DL.
JetBlue would certainly look at the regions IMO with 321NEO's.
Maybe NAX will come first though, with MAX's. I am hearing MAN-EWR is a go'er, maybe BHX is in the frame for similar.
With a lower cost base and more cost effective types it should give JBA / NAX a distinct advantage over the aging 757's the US3 tend to deploy to BHX etc.
Here's hoping...