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( Hopefully this is a non-lawyer explanation: )

"Expired" refers to what is officially the status. There was an expiration date on the offer, and it has long since past. There was a landing page that explained the offer, but it has long since been removed.

"But still working" means that, however, the application page itself is still there, it still works for people who go through and submit an application, and the terms continue to match was the old landing page stated (and which are documented for posterity in this thread).

So it's a difference between a "fully supported" "publicly promoted" application, that would have a landing site, and perhaps have a valid expieration date*, and a "still working but we don't know for how long" situation which we know works only from constantly accumulated anecdotes.

It's because FlyerTalk is an interactive community that we can report such "still works" status reliably. One person by themsevles couldn't do it as easily (they couldn't keep trying the app themselves every day) but every few days someone else comes along who tells us this link or that link just worked for them, and so we have another data point.


*Citi has in the past sometimes kept landing pages, not just application pages, up well past the official expiration date listed on the landing page. So "expired but still working" is not always limited to offers with landing pages gone.