Is it domestic or international? Sometimes not all international flights show up in all systems.
It's international with the outbound on an AF codeshare and the inbound on KLM metal.
Is the electronic ticket number in both reservations and clearly indicates all flights? That is the most important.
The eTicket # is the very same on both systems. However even when I search by eTicket #, only the inbound is showing on NWA and vice versa on DL.
Generally DL and NW will have different record locators. That doesn't mean anything. What is important is that you have an e-ticket associated with all segments.
Well at least it looks to be on the same eTickets. After a schedule change on the DL part, the itin broke in half. This is not catastrophic since my friend has all her segments still showing somewhere but it's extremely inconvenient that I cannot manage her booking properly anymore :-(