Weird... 5-6 used to be the PDX-NRT-PUS run; I was just on that in November.

Northwest has periodically shifted flight numbers around for whatever reason; i.e. 98/99 HNL-MSP and back became 808/809 (because Hawaii's area code is 808).

But with the Northwest-Delta merger, this is happening a lot more frequently, as the two airlines try to make sure they don't both have a flight with the same number, so that on the day all Northwest flights become Delta flights, there won't be duplication.

So 808/809 is now 624/625. I flew 808 a couple months ago, and by the time I returned, 809 had become 625. And the 557 PHL-MSP I booked at the beginning of December was, by the time I flew it a day or so ago, 1589.

And all these changes aren't just confusing to us - 1589's lead FA twice announced it as 1024, which is the new post-merger number of the MSP-PHL flight he'd arrived on the previous night. I had to check NWA.com on my phone before the door was closed to see whether they had changed the number again!