Originally Posted by
pogonation
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
.