Originally Posted by
Often1
This is the problem with B6, WN and others which do not interline.
The assumption that there will always be a readily available seat on another carrier and that the affected airline will push the ticket is dated at this point. Airlines are running ~85% LFs which means a lot of the flights won't have seats for rebooking anyways. And there have been plenty of instances where DL/AA/UA won't push or won't release those last few seats to OALs anyways. Looking back 20 years ago the situation was far different, with lower LFs and more willing airlines. And certainly having more options than not is a good thing. But it is not a panacea.