Originally Posted by spackman
If the Amtrak or bus segment is a CO code share, it should-As I understand it, any ticket utilizing a CO flight number should earn credit, subject to CO's Elite Qualifying Miles rules (e.g., if a "deep" discounted ticket, it must be purchaed at Continental.com to get full credit).
CO used to offer miles/points on the EWR-ABE bus. Since the full Y fare was pretty low some folks racked up segment credits that way. CO no longer offers such credit.