This has been an option on the website for a while, and has been posted in Jetstream for close to a year at least. Very few reasons check in would need to be undone, mostly it is to facilitate reissuing a ticket, since you can't reissue against a checked in coupon. LHG carriers/AC also have the option on their websites if you go to "check in again" there is an option to "check out".

IIRC, there was a time in the past when the website would have to uncheck you in in order to move your seat past the T-24 mark.

David

Another reason to un-checkin is if you checked in without your correct KTN entered in the PNR & didn't get TSA Pre. You fix this by un-checking, entering the correct KTN, and checking back in.

Undo checkin has been available for years (going back as far as the PMCO website, if I remember correctly)--I use it all the time to make last minute changes to flights for travelers who have already checked in (can't exchange a checked-in itinerary in Sabre)--but it's always been a bit of a pain to find the right series of buttons to get to the undo checkin flow.

Don’t need to uncheck for this. Just edit the KTN and it should automatically transmits/updates BP if it matches.

Not sure if Sabre lets you do this, but generally with UA’s system if you cancel out the reserved space for the checked in flights, it will automatically uncheck those coupons too. But again not positive if there are any restrictions on Sabre from cancelling space on day of travel.

Yeah, it does, but frequently I'll want to price an exchange without first releasing the existing space and (depending on the situation) I usually can't price an exchange unless the coupons are OPEN.

Agreed, this is years old. Quick search says 2015.

Post #2 of this thread confirms it was indeed there years ago, but didn't really work well.

Understood - I've used it 2-3 times as recently as last year, and it worked exactly as described in the JetStream post. No issues here.

In my case I was assigned BG2 instead of BG1, so I undid and redid checkin to try to fix. (Turned out I was part of an unannounced test of a new boarding order.)

IIRC, you can also split PNR for CPU on a re-check if you say no the first time.

What is the use case here?

Doing an un-check-in will subsequently show what an offer for upgrade is to the remaining seats in J/F during re-check-in. This is the underlying problem with pmCO's check-in limitations originally as part of SHARES.

David

When there's UG space available and you want it, you can't UG while checked in.

This is not at all my experience.

I used undo check-in on Friday... I got a "Mile Play" on my recent trip offering 600 miles to check in via the app (and another 800 if I used bag drop). Of course, I received the offer email after I had checked in (via the app), so wouldn't qualify by the T&C. So I undid check-in, then re-checked-in again via the app. I didn't get credit yet for the bag drop, though; my guess is even though I'd selected the bags online, scanned my BP at the shortcut kiosk, weighed my bags, and a UA agent came over to apply the tags, I did something with the kiosk that kicked me out of the offer (like when I told it to print my BP, as I always keep a paper copy).


It worked for me last time I had that happen, FWIW, but didn't the prior time. (Why UA was losing my KTN is another matter and annoying to only notice it when about to go through security).