Originally Posted by
readywhenyouare
Why doesn't Delta have a published policy on whether or not they will put you on another airline during irregular operations? ...
This has been answered many times. The policy is covered in Rule 240 of the Delta Contract of Carriage, section B.
"At Delta’s sole discretion and if acceptable to the passenger, Delta may arrange for the passenger to travel on another carrier or via ground
transportation."
Note the "at Delta's sole discretion" part. ...
Distilled answer... because the CoC is written by airline lawyers to protect the airline, not to protect the customer.