Originally Posted by georgetg

It's an interline agreement, not a codeshare or capacity purchase.
As such, there is no limit on aircraft size, count or seats.

Perfectly legal.

The main rub IMHO is from a union standpoint, replacing ALPA represented pilots with non-union represented pilots. To me that goes against the principle of having a national union, but I'm most likely in the minority here...

Cheers
George