Normally, the waitlist disappears after the flight is closed, so not seeing a waitlist now is extraneous to the real problem, which is the GA not running the waitlist prior to departure.

I would have been more proactive as T-15 approached on a flight of that distance and seeing empty seats on the app or up front. A quick word with the FA at the door might have prompted her to check with the GA. After the door closes, FAs are not supposed to move people up (and actually while the door is open, they're not supposed to either).

Maybe with seats weren't showing vacant due to misconnects, but GA still should have done the upgrades when they didn't show..

Looks like a definite GA fail.

There could well have been several misconnects, but you should have been brought forward before the door closed.

Once the door closed, the FAs can't do anything, so they can't move you forward even if they recognise you during the drinks service.

I agree with the above advice — write in and let UA know this happened. They should make a service recovery gesture, but at the least they ought to remind this GA to take care of the upgrades before closing the flight. I'd have thought the new no-blame system would help ward against this happening.

That's a shame. I would recommend writing to UA just so you can get a small customer service gesture. Don't be surprised if you get a generic reply telling you that upgrades are subject to availability inventory. Typical anti- customer attitude Funny how they never seem to have problems upgrading say a uniformed capitain, airline executive or any other non-rev.

The mystery deepens
filght status states

and

the seatmap shows 6 seats open

I always board at the very end - a huge advantage of that is I would have said something to the gate agent monitoring the app - I had something similar a couple months back LAS-SFO, 1 seat remaining told everyone to board - I asked about the seat - she had forgotten to clear it - and I got the seat.

Thanks for the different perspectives. I did take a glance at the app as I was boarding (early as 1K) and F still looked full so it must've been T-15 as to when it got cleared out. As someone who flies weekly and looks for flights at least every other day, the late surge to fill out F did feel a little odd, especially as they subsequently failed to show. My theory is that the removal of change fees leads people to book a lot of flights just based on the positive optionality of having no downside if they choose to not get on it, which is why I think this type of thing could reoccur. The weather could've played a part but I felt like something more than that just based upon my past experience and ORD that day. I did respond to the followup flight email United sends to atleast let them know how it occurred. Going forward, I'm going to just try and stick with a sure thing looking for PZ inventory than trying to play high odds otherwise.

If F still looked full at T-15, the passengers did not "choose not to get on it" for "no downside." They had checked in for the flight, and were marked as no-shows; for nonrefundable tickets, this would make the ticket forfeit.

The much more plausible explanation is that this was, in fact, no-shows due to a missed connection. Perhaps a party of 6 was traveling together.

It appear from flight status UA held the plane 25 minutes for "passengers with tight connections", so the intent well after the OP boarded was to wait for some of those connecting passengers ( United Airlines Makes Connecting the World Easier Than Ever with ConnectionSaver )

However what appears to have gone wrong is once UA/GA decided to wait no longer, OP (on board) did not get "upgraded" and notified. Suspect the plane had been held for the connecting so long, the GA was rushed or did not want to delay the flight any longer to do the "battlefield" upgrades.

So attempting to do one good deed, another good deed was not done.

That sounds very plausible to me. When we hold for connections, we are given a specific time that we can hold until. That time is based on the analysis, now from the connection saver program, of how long we can delay but still arrive on-time (enough). Without scrolling back up, I think the flight left 25min late and arrived 3min late which is consistent with holding the full amount of time.

I don't know how an agent is supposed to process upgrades in a situation like this when it is FC passengers that you've held for but who don't make it.

Generally from what I've seen the gate agent takes a couple extra minutes, comes on board with BPs for the upgrades and either finds the pax directly or deputizes a FA to get everyone reseated and then closes the door.

On the nitty gritty, not too sure -- if connection saver says hold 25 minutes, should the GA give up on the connectors at 23 minutes to push the upgrades to get the flight out at 25 minutes, or should the GA give up at 25 minutes and get the flight out at 27 minutes? (Or that is the same question you're considering?)

Right. I don't know the details of how they are supposed to handle that.

This is exactly what happened to me just over a week ago from IAD to LAX (789). F was full three days before the flight and remained full during boarding and all F passengers had checked in.

While seated with my daughter and son (we were all on the upgrade list as the top 3), I noticed one F seat became available at T-3. I said to my daughter that I might get upgraded. 2 min later, the gate agent came on board told me I got upgraded but it was too late for him to print a new boarding pass. He asked me to move to a specific seat in F and told FA on his way out before the door was closed. While the plane taxied to the runway for take-off, the app showed I was upgraded and reflected the new seat number.

For any FT near the top of UA upgrade standby list, do not board early. Just wait near the podium until you either get a boarding pass or are told that FC cabin is full. This applies to top two if App says that FC is booked full and checked-in full. If there is one or two seats available, the top three or four should wait to board. I trust that most GAs perform their duties well, but I am wishful for the last upgrade seat before the door is closed.
BTW, this type of thread will not appear if every FT follows this practice!
Cheers!

Golden Advice

1k flying into Denver today and applied 20 plus points to put me at the top of the upgrade list. Was put on the waitlist and still first as I was boarding the flight and seatmap has 2 empty seats. Figured I�d be upgraded on the plane, but sure enough we pushed back with 2 empty seats up front. I�m in row 7 and see the seats- not blocked off, just empty. Do I call and ask what the deal is? Flight is completely sold out- minus 2 empty�s in first