Originally Posted by
intuition
...And if the voucher leads to someone booking themselves in business and then booking a familymember in economy and uses the upgrades to travel togther,...
This is, unfortunately, no longer possible (as of May 5th 2025).
Originally Posted by
intuition
...They still need to up it a bit, because the vouchers won't work in lowest classes. Let's say they go to CHQ in light, but can find S class. Then apply vouchers and live the life in A3 business!...
The vouchers surely do work in lowest classes. You just have to select at least Flex, instead of Light, which, if we're comparing fares and classes of such international routes like from Germany, will be a cheaper option and will even give you more miles, than to pay up for S in Light.