Probably giving them back because they are commited to taking the new ones,can't recruit pilots quickly enough to crew them (now that the short-term relief provided by the Boeing strike is over)and they are, anyway, getting a bit rough around the edges after 6 years of TLC 8 sectors a day by our lovely pax with one cleaning a day.If you can't stop the new ones coming in the frontdoor dump the old ones out the back!Suspect in the current industry wide climate they probably pay less lease charges for new than they pay/payed for the first ones.