I went to the airport and she was willing to do it but it wouldn’t work. I called the call center and they couldn’t do it because the earlier flight was not an allowable connection to my onward flight the following day.

reading the voucher rules it seems changes are permitted via call centre according to underlying fare but will incur €23 fee. I guess you might have to forfeit your voucher if no I class available but in theory looks like you can change if your base fare allows. Not sure whether they allow it as a free same day or it now incurs fare difference.

The "pick another flight the same day" option only applies to direct Aegean flights. It sounds like you had a connecting flight which would make this not eligible.

Data point: I just changed a previously voucher-upgraded flight for the first time ever. Same flight but two days later. The process was simple and I told the agent I only wanted to actually change if the confirmed upgrade was still available. It took her a little while to check and the whole call took about 12 minutes. I had to pay the 23 Euro telephone fee, but.... meah...

Interestingly, business class loads must be quite light on LHR-ATH at the moment. I was very happy when even the original upgrade went through without going on the waiting list, but the flight I just changed is in just 12 days time. The fare difference was only 7 Euro (originally booked dirt-cheap months ago) and from the attached you can I'm only the 2nd person to select a seat up there, for now. That really surprised me at such short notice!

https://cimg5.ibsrv.net/gimg/www.fly...2acb01dfec.jpg

Wait! This wasn't what you were asking! You wanted to change to an earlier flight, while staying in business class with your BK I-issued ticket via upgrade voucher! Or did I misunderstand that part?
Of course you can ask the call center to remove the upgrade (this is only forbidden on upgraded "pass" tickets) and then basically do whatever you want with your booking.
Moreover, what Xandrios wrote should also be taken into account (same-day changes are only allowed on single-flight tickets, once there's a connections, then the option to change flights simply doesn't become available when it otherwise would).

Got 4 upgrade certs expiring tomorrow. There is no I availability on my flight so if I were to waitlist the upgrade would the voucher be used or would it expire and then when waitlist opens up, there would no longer be a voucher to use?

It would expire. I THINK a new voucher would be used.

Annoyingly gold will expire at the same time but then an LX F to USA and 4 sectors A3 will get me back to gold. I was hoping I could use the upgrade voucher on the A3 sectors :(

Well, you will at least soft-land on silver, so you'll get 2 silver upgrade vouchers, which will also expire as soon as you reach gold again, so you can definitely wait-list at least 2 of your upcoming A3 flights with these (I'd start with the very first, so in case this doesn't clear you can try your luck with the next ones).

As for your current vouchers, I guess it's already too late now, unless you can upgrade someone else in the next 3 hours. (btw sorry, can't help you with that myself, as all my future flights also currently lack I class)
It'd still be quite risky, since, if the upgrade doesn't get issued right away, there's still a good chance you'll end up using your next vouchers, so I'd say forget about it and make use of your silver vouchers as described ;)​​​​​​.

I am waitlisted now for 4 sectors which intrestingly show only 2 seats booked out of 12 seats and 3 days before departure, cash upgrade challenge for the same flight cleared today yet no space for seat upgrade with vouchers.... 😀🤷‍♂️

Is this the new norm?

According to my data points, the short answer would be "yes"!
The longer answer involves considering the specific route, the time of year (for example you're going to be flying within the Catholic Easter holiday) and likely also number of wait-listed vouchers, how full economy is etc.

But I think it is almost a certainty that your upgrades will clear. Like, over 80%, I'd say about 98-99% certain, even if booking class I (award/upgrade space) never becomes available. ;)
BTW in the T&C's of the upgrade bid it states that your bid can be accepted until up to 7 hours before departure (not 3 days!).
Which is likely also why some of my recent upgrades have cleared at around that time!

Quick question if i booked a flex fare on an OTA can i use my coupon or it's only if booked via A3 website?

You can, as long as the ticket number starts with 390. Which isn't guaranteed, however, usually it would be for bookings containing only Aegean flights.

Also make sure you're actually booking "Aegean's" Flex fare on the OTA's website and not any "flexibility" deriving solely from the OTA's policies while actually booking into the "light" fare (which is often the case), which, combined with booking classes P, U or T, won't allow for an upgrade via voucher.

And a follow up as well as data point:
I had wait-listed us for our upcoming flight just about 3 weeks ago with my 4 gold coupons.
I checked us in online as soon as it became available. In fact, this time I actually managed to get us to be the 1st-2nd-3rd and 4th to check in!

There has been zero (0) availability in booking class I (or even X for that matter) the entire time ever since this flight became available for booking and it stayed like that the whole time during the past days leading up to the check-in window and even after it (it's the week after Catholic Easter, not officially a "cut-off" period for upgrades, but still one that sees no I on my route).
3 rows of business class (12 seats), initially 2 seats reserved, then 4 and as of around 1 week ago 5, but they had at least stayed at 5 until now.

Exactly 19 hours and 12 minutes prior to the scheduled departure I got the first 2 emails confirming those (2) upgrades and 12 minutes later I got the other 2 emails.
I total I believe that a single other passenger was upgraded, since C7 changed to C2 and the seat-map also shows an additional seat reserved.

This time the system allocated us the entire 2nd row, which was still unoccupied, while putting the solo upgraded passenger alone on the right side in row 3. I couldn't choose seats during check-in, but if I could I would have picked exactly the same.

Of course we're very excited, that we were once again granted 4 upgrades on the same flight, the only drawback of this occurring so "late" being the fact that we can no longer pre-select our meals. Which, unfortunately, will be exactly the same as last time we got the 4x upgrades, the scrambled eggs + chicken muffin or the eggs + tomato sauce... So I hope we can grab something more savoury in the lounge and then just eat the joghurt from the menu or whatever we bring along for our kids (unless they somehow manage to serve them a children's option :rolleyes:​​​​​​).

I waitlisted my wife for an upgrade on an upcoming fligh with a voucher, I see both the C and Y segment in the reservation. Now check-in time has come, and it seems she was moved from 9C (Up front seating, comfortflex fare) to 12B (2nd exit row), coincidentally next to me.. But while my check-in works, hers doesn’t go through.
I was expecting her to be upgraded to C rather than moved to another seat (different PNR’s but linked at checkin time for the outbound flight). I’m hoping she will be upgraded, as is this is the flight that will get her to Gold and the voucher will expire anyway.
I can add the security fast track, but when the moment comes to “pay”, an error message pops up. (Same whether I add the fast track or not)

Info

Unable to check-in

You are not able to use the mobile check in. Please contact an agent at the airport.


update: the upgrade came through at 19:35 Greek time tonight and check-in was possible. (36.5 hours before the flight). The positive about this is that we will both have access to the A3 lounge and won’t be deferred to the goldair one.